Index: include/llvm/Support/TargetRegistry.h
===================================================================
--- include/llvm/Support/TargetRegistry.h
+++ include/llvm/Support/TargetRegistry.h
@@ -112,7 +112,7 @@
       TargetMachine &TM, std::unique_ptr<MCStreamer> &&Streamer);
   typedef MCAsmBackend *(*MCAsmBackendCtorTy)(const Target &T,
                                               const MCRegisterInfo &MRI,
-                                              StringRef TT, StringRef CPU);
+                                              const Triple &TT, StringRef CPU);
   typedef MCTargetAsmParser *(*MCAsmParserCtorTy)(
       MCSubtargetInfo &STI, MCAsmParser &P, const MCInstrInfo &MII,
       const MCTargetOptions &Options);
@@ -369,12 +369,12 @@
 
   /// createMCAsmBackend - Create a target specific assembly parser.
   ///
-  /// \param Triple The target triple string.
-  MCAsmBackend *createMCAsmBackend(const MCRegisterInfo &MRI, StringRef Triple,
-                                   StringRef CPU) const {
+  /// \param TheTriple The target triple string.
+  MCAsmBackend *createMCAsmBackend(const MCRegisterInfo &MRI,
+                                   StringRef TheTriple, StringRef CPU) const {
     if (!MCAsmBackendCtorFn)
       return nullptr;
-    return MCAsmBackendCtorFn(*this, MRI, Triple, CPU);
+    return MCAsmBackendCtorFn(*this, MRI, Triple(TheTriple), CPU);
   }
 
   /// createMCAsmParser - Create a target specific assembly parser.
@@ -1112,8 +1112,8 @@
 
 private:
   static MCAsmBackend *Allocator(const Target &T, const MCRegisterInfo &MRI,
-                                 StringRef Triple, StringRef CPU) {
-    return new MCAsmBackendImpl(T, MRI, Triple, CPU);
+                                 const Triple &TheTriple, StringRef CPU) {
+    return new MCAsmBackendImpl(T, MRI, TheTriple, CPU);
   }
 };
 
Index: lib/Target/AArch64/MCTargetDesc/AArch64AsmBackend.cpp
===================================================================
--- lib/Target/AArch64/MCTargetDesc/AArch64AsmBackend.cpp
+++ lib/Target/AArch64/MCTargetDesc/AArch64AsmBackend.cpp
@@ -520,10 +520,9 @@
 }
 
 MCAsmBackend *llvm::createAArch64leAsmBackend(const Target &T,
-                                            const MCRegisterInfo &MRI,
-                                            StringRef TT, StringRef CPU) {
-  Triple TheTriple(TT);
-
+                                              const MCRegisterInfo &MRI,
+                                              const Triple &TheTriple,
+                                              StringRef CPU) {
   if (TheTriple.isOSDarwin())
     return new DarwinAArch64AsmBackend(T, MRI);
 
@@ -533,10 +532,9 @@
 }
 
 MCAsmBackend *llvm::createAArch64beAsmBackend(const Target &T,
-                                            const MCRegisterInfo &MRI,
-                                            StringRef TT, StringRef CPU) {
-  Triple TheTriple(TT);
-
+                                              const MCRegisterInfo &MRI,
+                                              const Triple &TheTriple,
+                                              StringRef CPU) {
   assert(TheTriple.isOSBinFormatELF() &&
          "Big endian is only supported for ELF targets!");
   uint8_t OSABI = MCELFObjectTargetWriter::getOSABI(TheTriple.getOS());
Index: lib/Target/AArch64/MCTargetDesc/AArch64MCTargetDesc.h
===================================================================
--- lib/Target/AArch64/MCTargetDesc/AArch64MCTargetDesc.h
+++ lib/Target/AArch64/MCTargetDesc/AArch64MCTargetDesc.h
@@ -43,11 +43,11 @@
                                           const MCRegisterInfo &MRI,
                                           MCContext &Ctx);
 MCAsmBackend *createAArch64leAsmBackend(const Target &T,
-                                        const MCRegisterInfo &MRI, StringRef TT,
-                                        StringRef CPU);
+                                        const MCRegisterInfo &MRI,
+                                        const Triple &TT, StringRef CPU);
 MCAsmBackend *createAArch64beAsmBackend(const Target &T,
-                                        const MCRegisterInfo &MRI, StringRef TT,
-                                        StringRef CPU);
+                                        const MCRegisterInfo &MRI,
+                                        const Triple &TT, StringRef CPU);
 
 MCObjectWriter *createAArch64ELFObjectWriter(raw_pwrite_stream &OS,
                                              uint8_t OSABI,
Index: lib/Target/ARM/MCTargetDesc/ARMAsmBackend.h
===================================================================
--- lib/Target/ARM/MCTargetDesc/ARMAsmBackend.h
+++ lib/Target/ARM/MCTargetDesc/ARMAsmBackend.h
@@ -23,9 +23,10 @@
   bool isThumbMode;    // Currently emitting Thumb code.
   bool IsLittleEndian; // Big or little endian.
 public:
-  ARMAsmBackend(const Target &T, StringRef TT, bool IsLittle)
-      : MCAsmBackend(), STI(ARM_MC::createARMMCSubtargetInfo(TT, "", "")),
-        isThumbMode(TT.startswith("thumb")), IsLittleEndian(IsLittle) {}
+  ARMAsmBackend(const Target &T, const Triple &TT, bool IsLittle)
+      : MCAsmBackend(), STI(ARM_MC::createARMMCSubtargetInfo(TT.str(), "", "")),
+        isThumbMode(TT.getArchName().startswith("thumb")),
+        IsLittleEndian(IsLittle) {}
 
   ~ARMAsmBackend() override { delete STI; }
 
Index: lib/Target/ARM/MCTargetDesc/ARMAsmBackend.cpp
===================================================================
--- lib/Target/ARM/MCTargetDesc/ARMAsmBackend.cpp
+++ lib/Target/ARM/MCTargetDesc/ARMAsmBackend.cpp
@@ -744,10 +744,9 @@
 }
 
 MCAsmBackend *llvm::createARMAsmBackend(const Target &T,
-                                        const MCRegisterInfo &MRI, StringRef TT,
-                                        StringRef CPU, bool isLittle) {
-  Triple TheTriple(TT);
-
+                                        const MCRegisterInfo &MRI,
+                                        const Triple &TheTriple, StringRef CPU,
+                                        bool isLittle) {
   switch (TheTriple.getObjectFormat()) {
   default:
     llvm_unreachable("unsupported object format");
@@ -764,38 +763,38 @@
             .Cases("armv7s", "thumbv7s", MachO::CPU_SUBTYPE_ARM_V7S)
             .Default(MachO::CPU_SUBTYPE_ARM_V7);
 
-    return new ARMAsmBackendDarwin(T, TT, CS);
+    return new ARMAsmBackendDarwin(T, TheTriple, CS);
   }
   case Triple::COFF:
     assert(TheTriple.isOSWindows() && "non-Windows ARM COFF is not supported");
-    return new ARMAsmBackendWinCOFF(T, TT);
+    return new ARMAsmBackendWinCOFF(T, TheTriple);
   case Triple::ELF:
     assert(TheTriple.isOSBinFormatELF() && "using ELF for non-ELF target");
-    uint8_t OSABI = MCELFObjectTargetWriter::getOSABI(Triple(TT).getOS());
-    return new ARMAsmBackendELF(T, TT, OSABI, isLittle);
+    uint8_t OSABI = MCELFObjectTargetWriter::getOSABI(TheTriple.getOS());
+    return new ARMAsmBackendELF(T, TheTriple, OSABI, isLittle);
   }
 }
 
 MCAsmBackend *llvm::createARMLEAsmBackend(const Target &T,
                                           const MCRegisterInfo &MRI,
-                                          StringRef TT, StringRef CPU) {
+                                          const Triple &TT, StringRef CPU) {
   return createARMAsmBackend(T, MRI, TT, CPU, true);
 }
 
 MCAsmBackend *llvm::createARMBEAsmBackend(const Target &T,
                                           const MCRegisterInfo &MRI,
-                                          StringRef TT, StringRef CPU) {
+                                          const Triple &TT, StringRef CPU) {
   return createARMAsmBackend(T, MRI, TT, CPU, false);
 }
 
 MCAsmBackend *llvm::createThumbLEAsmBackend(const Target &T,
                                             const MCRegisterInfo &MRI,
-                                            StringRef TT, StringRef CPU) {
+                                            const Triple &TT, StringRef CPU) {
   return createARMAsmBackend(T, MRI, TT, CPU, true);
 }
 
 MCAsmBackend *llvm::createThumbBEAsmBackend(const Target &T,
                                             const MCRegisterInfo &MRI,
-                                            StringRef TT, StringRef CPU) {
+                                            const Triple &TT, StringRef CPU) {
   return createARMAsmBackend(T, MRI, TT, CPU, false);
 }
Index: lib/Target/ARM/MCTargetDesc/ARMAsmBackendDarwin.h
===================================================================
--- lib/Target/ARM/MCTargetDesc/ARMAsmBackendDarwin.h
+++ lib/Target/ARM/MCTargetDesc/ARMAsmBackendDarwin.h
@@ -18,7 +18,8 @@
 class ARMAsmBackendDarwin : public ARMAsmBackend {
 public:
   const MachO::CPUSubTypeARM Subtype;
-  ARMAsmBackendDarwin(const Target &T, StringRef TT, MachO::CPUSubTypeARM st)
+  ARMAsmBackendDarwin(const Target &T, const Triple &TT,
+                      MachO::CPUSubTypeARM st)
       : ARMAsmBackend(T, TT, /* IsLittleEndian */ true), Subtype(st) {
     HasDataInCodeSupport = true;
   }
Index: lib/Target/ARM/MCTargetDesc/ARMAsmBackendELF.h
===================================================================
--- lib/Target/ARM/MCTargetDesc/ARMAsmBackendELF.h
+++ lib/Target/ARM/MCTargetDesc/ARMAsmBackendELF.h
@@ -15,7 +15,8 @@
 class ARMAsmBackendELF : public ARMAsmBackend {
 public:
   uint8_t OSABI;
-  ARMAsmBackendELF(const Target &T, StringRef TT, uint8_t OSABI, bool IsLittle)
+  ARMAsmBackendELF(const Target &T, const Triple &TT, uint8_t OSABI,
+                   bool IsLittle)
       : ARMAsmBackend(T, TT, IsLittle), OSABI(OSABI) {}
 
   MCObjectWriter *createObjectWriter(raw_pwrite_stream &OS) const override {
Index: lib/Target/ARM/MCTargetDesc/ARMAsmBackendWinCOFF.h
===================================================================
--- lib/Target/ARM/MCTargetDesc/ARMAsmBackendWinCOFF.h
+++ lib/Target/ARM/MCTargetDesc/ARMAsmBackendWinCOFF.h
@@ -15,8 +15,8 @@
 namespace {
 class ARMAsmBackendWinCOFF : public ARMAsmBackend {
 public:
-  ARMAsmBackendWinCOFF(const Target &T, StringRef Triple)
-      : ARMAsmBackend(T, Triple, true) {}
+  ARMAsmBackendWinCOFF(const Target &T, const Triple &TheTriple)
+      : ARMAsmBackend(T, TheTriple, true) {}
   MCObjectWriter *createObjectWriter(raw_pwrite_stream &OS) const override {
     return createARMWinCOFFObjectWriter(OS, /*Is64Bit=*/false);
   }
Index: lib/Target/ARM/MCTargetDesc/ARMMCTargetDesc.h
===================================================================
--- lib/Target/ARM/MCTargetDesc/ARMMCTargetDesc.h
+++ lib/Target/ARM/MCTargetDesc/ARMMCTargetDesc.h
@@ -65,20 +65,22 @@
                                         MCContext &Ctx);
 
 MCAsmBackend *createARMAsmBackend(const Target &T, const MCRegisterInfo &MRI,
-                                  StringRef TT, StringRef CPU,
+                                  const Triple &TT, StringRef CPU,
                                   bool IsLittleEndian);
 
 MCAsmBackend *createARMLEAsmBackend(const Target &T, const MCRegisterInfo &MRI,
-                                  StringRef TT, StringRef CPU);
+                                    const Triple &TT, StringRef CPU);
 
 MCAsmBackend *createARMBEAsmBackend(const Target &T, const MCRegisterInfo &MRI,
-                                  StringRef TT, StringRef CPU);
+                                    const Triple &TT, StringRef CPU);
 
-MCAsmBackend *createThumbLEAsmBackend(const Target &T, const MCRegisterInfo &MRI,
-                                      StringRef TT, StringRef CPU);
+MCAsmBackend *createThumbLEAsmBackend(const Target &T,
+                                      const MCRegisterInfo &MRI,
+                                      const Triple &TT, StringRef CPU);
 
-MCAsmBackend *createThumbBEAsmBackend(const Target &T, const MCRegisterInfo &MRI,
-                                      StringRef TT, StringRef CPU);
+MCAsmBackend *createThumbBEAsmBackend(const Target &T,
+                                      const MCRegisterInfo &MRI,
+                                      const Triple &TT, StringRef CPU);
 
 // Construct a PE/COFF machine code streamer which will generate a PE/COFF
 // object file.
Index: lib/Target/BPF/MCTargetDesc/BPFAsmBackend.cpp
===================================================================
--- lib/Target/BPF/MCTargetDesc/BPFAsmBackend.cpp
+++ lib/Target/BPF/MCTargetDesc/BPFAsmBackend.cpp
@@ -87,13 +87,13 @@
 }
 
 MCAsmBackend *llvm::createBPFAsmBackend(const Target &T,
-                                        const MCRegisterInfo &MRI, StringRef TT,
-                                        StringRef CPU) {
+                                        const MCRegisterInfo &MRI,
+                                        const Triple &TT, StringRef CPU) {
   return new BPFAsmBackend(/*IsLittleEndian=*/true);
 }
 
 MCAsmBackend *llvm::createBPFbeAsmBackend(const Target &T,
-                                          const MCRegisterInfo &MRI, StringRef TT,
-                                          StringRef CPU) {
+                                          const MCRegisterInfo &MRI,
+                                          const Triple &TT, StringRef CPU) {
   return new BPFAsmBackend(/*IsLittleEndian=*/false);
 }
Index: lib/Target/BPF/MCTargetDesc/BPFMCTargetDesc.h
===================================================================
--- lib/Target/BPF/MCTargetDesc/BPFMCTargetDesc.h
+++ lib/Target/BPF/MCTargetDesc/BPFMCTargetDesc.h
@@ -25,8 +25,9 @@
 class MCObjectWriter;
 class MCRegisterInfo;
 class MCSubtargetInfo;
-class Target;
 class StringRef;
+class Target;
+class Triple;
 class raw_ostream;
 class raw_pwrite_stream;
 
@@ -42,9 +43,9 @@
                                         MCContext &Ctx);
 
 MCAsmBackend *createBPFAsmBackend(const Target &T, const MCRegisterInfo &MRI,
-                                  StringRef TT, StringRef CPU);
+                                  const Triple &TT, StringRef CPU);
 MCAsmBackend *createBPFbeAsmBackend(const Target &T, const MCRegisterInfo &MRI,
-                                    StringRef TT, StringRef CPU);
+                                    const Triple &TT, StringRef CPU);
 
 MCObjectWriter *createBPFELFObjectWriter(raw_pwrite_stream &OS,
                                          uint8_t OSABI, bool IsLittleEndian);
Index: lib/Target/Hexagon/MCTargetDesc/HexagonAsmBackend.cpp
===================================================================
--- lib/Target/Hexagon/MCTargetDesc/HexagonAsmBackend.cpp
+++ lib/Target/Hexagon/MCTargetDesc/HexagonAsmBackend.cpp
@@ -288,8 +288,8 @@
 namespace llvm {
 MCAsmBackend *createHexagonAsmBackend(Target const &T,
                                       MCRegisterInfo const & /*MRI*/,
-                                      StringRef TT, StringRef CPU) {
-  uint8_t OSABI = MCELFObjectTargetWriter::getOSABI(Triple(TT).getOS());
+                                      const Triple &TT, StringRef CPU) {
+  uint8_t OSABI = MCELFObjectTargetWriter::getOSABI(TT.getOS());
   return new HexagonAsmBackend(T, OSABI, CPU);
 }
 }
Index: lib/Target/Hexagon/MCTargetDesc/HexagonMCTargetDesc.h
===================================================================
--- lib/Target/Hexagon/MCTargetDesc/HexagonMCTargetDesc.h
+++ lib/Target/Hexagon/MCTargetDesc/HexagonMCTargetDesc.h
@@ -27,6 +27,7 @@
 class MCRegisterInfo;
 class MCSubtargetInfo;
 class Target;
+class Triple;
 class StringRef;
 class raw_ostream;
 class raw_pwrite_stream;
@@ -42,8 +43,8 @@
                                           MCContext &MCT);
 
 MCAsmBackend *createHexagonAsmBackend(Target const &T,
-                                      MCRegisterInfo const &MRI, StringRef TT,
-                                      StringRef CPU);
+                                      MCRegisterInfo const &MRI,
+                                      const Triple &TT, StringRef CPU);
 
 MCObjectWriter *createHexagonELFObjectWriter(raw_pwrite_stream &OS,
                                              uint8_t OSABI, StringRef CPU);
Index: lib/Target/Mips/MCTargetDesc/MipsAsmBackend.cpp
===================================================================
--- lib/Target/Mips/MCTargetDesc/MipsAsmBackend.cpp
+++ lib/Target/Mips/MCTargetDesc/MipsAsmBackend.cpp
@@ -417,32 +417,27 @@
 // MCAsmBackend
 MCAsmBackend *llvm::createMipsAsmBackendEL32(const Target &T,
                                              const MCRegisterInfo &MRI,
-                                             StringRef TT,
-                                             StringRef CPU) {
-  return new MipsAsmBackend(T, Triple(TT).getOS(),
-                            /*IsLittle*/true, /*Is64Bit*/false);
+                                             const Triple &TT, StringRef CPU) {
+  return new MipsAsmBackend(T, TT.getOS(), /*IsLittle*/ true,
+                            /*Is64Bit*/ false);
 }
 
 MCAsmBackend *llvm::createMipsAsmBackendEB32(const Target &T,
                                              const MCRegisterInfo &MRI,
-                                             StringRef TT,
-                                             StringRef CPU) {
-  return new MipsAsmBackend(T, Triple(TT).getOS(),
-                            /*IsLittle*/false, /*Is64Bit*/false);
+                                             const Triple &TT, StringRef CPU) {
+  return new MipsAsmBackend(T, TT.getOS(), /*IsLittle*/ false,
+                            /*Is64Bit*/ false);
 }
 
 MCAsmBackend *llvm::createMipsAsmBackendEL64(const Target &T,
                                              const MCRegisterInfo &MRI,
-                                             StringRef TT,
-                                             StringRef CPU) {
-  return new MipsAsmBackend(T, Triple(TT).getOS(),
-                            /*IsLittle*/true, /*Is64Bit*/true);
+                                             const Triple &TT, StringRef CPU) {
+  return new MipsAsmBackend(T, TT.getOS(), /*IsLittle*/ true, /*Is64Bit*/ true);
 }
 
 MCAsmBackend *llvm::createMipsAsmBackendEB64(const Target &T,
                                              const MCRegisterInfo &MRI,
-                                             StringRef TT,
-                                             StringRef CPU) {
-  return new MipsAsmBackend(T, Triple(TT).getOS(),
-                            /*IsLittle*/false, /*Is64Bit*/true);
+                                             const Triple &TT, StringRef CPU) {
+  return new MipsAsmBackend(T, TT.getOS(), /*IsLittle*/ false,
+                            /*Is64Bit*/ true);
 }
Index: lib/Target/Mips/MCTargetDesc/MipsMCTargetDesc.h
===================================================================
--- lib/Target/Mips/MCTargetDesc/MipsMCTargetDesc.h
+++ lib/Target/Mips/MCTargetDesc/MipsMCTargetDesc.h
@@ -26,6 +26,7 @@
 class MCSubtargetInfo;
 class StringRef;
 class Target;
+class Triple;
 class raw_ostream;
 class raw_pwrite_stream;
 
@@ -42,17 +43,17 @@
                                          MCContext &Ctx);
 
 MCAsmBackend *createMipsAsmBackendEB32(const Target &T,
-                                       const MCRegisterInfo &MRI, StringRef TT,
-                                       StringRef CPU);
+                                       const MCRegisterInfo &MRI,
+                                       const Triple &TT, StringRef CPU);
 MCAsmBackend *createMipsAsmBackendEL32(const Target &T,
-                                       const MCRegisterInfo &MRI, StringRef TT,
-                                       StringRef CPU);
+                                       const MCRegisterInfo &MRI,
+                                       const Triple &TT, StringRef CPU);
 MCAsmBackend *createMipsAsmBackendEB64(const Target &T,
-                                       const MCRegisterInfo &MRI, StringRef TT,
-                                       StringRef CPU);
+                                       const MCRegisterInfo &MRI,
+                                       const Triple &TT, StringRef CPU);
 MCAsmBackend *createMipsAsmBackendEL64(const Target &T,
-                                       const MCRegisterInfo &MRI, StringRef TT,
-                                       StringRef CPU);
+                                       const MCRegisterInfo &MRI,
+                                       const Triple &TT, StringRef CPU);
 
 MCObjectWriter *createMipsELFObjectWriter(raw_pwrite_stream &OS, uint8_t OSABI,
                                           bool IsLittleEndian, bool Is64Bit);
Index: lib/Target/PowerPC/MCTargetDesc/PPCAsmBackend.cpp
===================================================================
--- lib/Target/PowerPC/MCTargetDesc/PPCAsmBackend.cpp
+++ lib/Target/PowerPC/MCTargetDesc/PPCAsmBackend.cpp
@@ -230,11 +230,11 @@
 
 MCAsmBackend *llvm::createPPCAsmBackend(const Target &T,
                                         const MCRegisterInfo &MRI,
-                                        StringRef TT, StringRef CPU) {
-  if (Triple(TT).isOSDarwin())
+                                        const Triple &TT, StringRef CPU) {
+  if (TT.isOSDarwin())
     return new DarwinPPCAsmBackend(T);
 
-  uint8_t OSABI = MCELFObjectTargetWriter::getOSABI(Triple(TT).getOS());
-  bool IsLittleEndian = Triple(TT).getArch() == Triple::ppc64le;
+  uint8_t OSABI = MCELFObjectTargetWriter::getOSABI(TT.getOS());
+  bool IsLittleEndian = TT.getArch() == Triple::ppc64le;
   return new ELFPPCAsmBackend(T, IsLittleEndian, OSABI);
 }
Index: lib/Target/PowerPC/MCTargetDesc/PPCMCTargetDesc.h
===================================================================
--- lib/Target/PowerPC/MCTargetDesc/PPCMCTargetDesc.h
+++ lib/Target/PowerPC/MCTargetDesc/PPCMCTargetDesc.h
@@ -29,6 +29,7 @@
 class MCRegisterInfo;
 class MCSubtargetInfo;
 class Target;
+class Triple;
 class StringRef;
 class raw_pwrite_stream;
 class raw_ostream;
@@ -42,7 +43,7 @@
                                       MCContext &Ctx);
 
 MCAsmBackend *createPPCAsmBackend(const Target &T, const MCRegisterInfo &MRI,
-                                  StringRef TT, StringRef CPU);
+                                  const Triple &TT, StringRef CPU);
 
 /// Construct an PPC ELF object writer.
 MCObjectWriter *createPPCELFObjectWriter(raw_pwrite_stream &OS, bool Is64Bit,
Index: lib/Target/R600/MCTargetDesc/AMDGPUAsmBackend.cpp
===================================================================
--- lib/Target/R600/MCTargetDesc/AMDGPUAsmBackend.cpp
+++ lib/Target/R600/MCTargetDesc/AMDGPUAsmBackend.cpp
@@ -139,7 +139,6 @@
 
 MCAsmBackend *llvm::createAMDGPUAsmBackend(const Target &T,
                                            const MCRegisterInfo &MRI,
-                                           StringRef TT,
-                                           StringRef CPU) {
+                                           const Triple &TT, StringRef CPU) {
   return new ELFAMDGPUAsmBackend(T);
 }
Index: lib/Target/R600/MCTargetDesc/AMDGPUMCTargetDesc.h
===================================================================
--- lib/Target/R600/MCTargetDesc/AMDGPUMCTargetDesc.h
+++ lib/Target/R600/MCTargetDesc/AMDGPUMCTargetDesc.h
@@ -28,6 +28,7 @@
 class MCRegisterInfo;
 class MCSubtargetInfo;
 class Target;
+class Triple;
 class raw_pwrite_stream;
 class raw_ostream;
 
@@ -43,7 +44,7 @@
                                      MCContext &Ctx);
 
 MCAsmBackend *createAMDGPUAsmBackend(const Target &T, const MCRegisterInfo &MRI,
-                                     StringRef TT, StringRef CPU);
+                                     const Triple &TT, StringRef CPU);
 
 MCObjectWriter *createAMDGPUELFObjectWriter(raw_pwrite_stream &OS);
 } // End llvm namespace
Index: lib/Target/Sparc/MCTargetDesc/SparcAsmBackend.cpp
===================================================================
--- lib/Target/Sparc/MCTargetDesc/SparcAsmBackend.cpp
+++ lib/Target/Sparc/MCTargetDesc/SparcAsmBackend.cpp
@@ -297,10 +297,8 @@
 
 } // end anonymous namespace
 
-
 MCAsmBackend *llvm::createSparcAsmBackend(const Target &T,
                                           const MCRegisterInfo &MRI,
-                                          StringRef TT,
-                                          StringRef CPU) {
-  return new ELFSparcAsmBackend(T, Triple(TT).getOS());
+                                          const Triple &TT, StringRef CPU) {
+  return new ELFSparcAsmBackend(T, TT.getOS());
 }
Index: lib/Target/Sparc/MCTargetDesc/SparcMCTargetDesc.h
===================================================================
--- lib/Target/Sparc/MCTargetDesc/SparcMCTargetDesc.h
+++ lib/Target/Sparc/MCTargetDesc/SparcMCTargetDesc.h
@@ -25,6 +25,7 @@
 class MCRegisterInfo;
 class MCSubtargetInfo;
 class Target;
+class Triple;
 class StringRef;
 class raw_pwrite_stream;
 class raw_ostream;
@@ -37,7 +38,7 @@
                                         const MCRegisterInfo &MRI,
                                         MCContext &Ctx);
 MCAsmBackend *createSparcAsmBackend(const Target &T, const MCRegisterInfo &MRI,
-                                    StringRef TT, StringRef CPU);
+                                    const Triple &TT, StringRef CPU);
 MCObjectWriter *createSparcELFObjectWriter(raw_pwrite_stream &OS, bool Is64Bit,
                                            bool IsLIttleEndian, uint8_t OSABI);
 } // End llvm namespace
Index: lib/Target/SystemZ/MCTargetDesc/SystemZMCAsmBackend.cpp
===================================================================
--- lib/Target/SystemZ/MCTargetDesc/SystemZMCAsmBackend.cpp
+++ lib/Target/SystemZ/MCTargetDesc/SystemZMCAsmBackend.cpp
@@ -111,7 +111,7 @@
 
 MCAsmBackend *llvm::createSystemZMCAsmBackend(const Target &T,
                                               const MCRegisterInfo &MRI,
-                                              StringRef TT, StringRef CPU) {
-  uint8_t OSABI = MCELFObjectTargetWriter::getOSABI(Triple(TT).getOS());
+                                              const Triple &TT, StringRef CPU) {
+  uint8_t OSABI = MCELFObjectTargetWriter::getOSABI(TT.getOS());
   return new SystemZMCAsmBackend(OSABI);
 }
Index: lib/Target/SystemZ/MCTargetDesc/SystemZMCTargetDesc.h
===================================================================
--- lib/Target/SystemZ/MCTargetDesc/SystemZMCTargetDesc.h
+++ lib/Target/SystemZ/MCTargetDesc/SystemZMCTargetDesc.h
@@ -23,6 +23,7 @@
 class MCSubtargetInfo;
 class StringRef;
 class Target;
+class Triple;
 class raw_pwrite_stream;
 class raw_ostream;
 
@@ -84,7 +85,7 @@
 
 MCAsmBackend *createSystemZMCAsmBackend(const Target &T,
                                         const MCRegisterInfo &MRI,
-                                        StringRef TT, StringRef CPU);
+                                        const Triple &TT, StringRef CPU);
 
 MCObjectWriter *createSystemZObjectWriter(raw_pwrite_stream &OS, uint8_t OSABI);
 } // end namespace llvm
Index: lib/Target/X86/MCTargetDesc/X86AsmBackend.cpp
===================================================================
--- lib/Target/X86/MCTargetDesc/X86AsmBackend.cpp
+++ lib/Target/X86/MCTargetDesc/X86AsmBackend.cpp
@@ -790,10 +790,8 @@
 
 MCAsmBackend *llvm::createX86_32AsmBackend(const Target &T,
                                            const MCRegisterInfo &MRI,
-                                           StringRef TT,
+                                           const Triple &TheTriple,
                                            StringRef CPU) {
-  Triple TheTriple(TT);
-
   if (TheTriple.isOSBinFormatMachO())
     return new DarwinX86_32AsmBackend(T, MRI, CPU);
 
@@ -806,10 +804,8 @@
 
 MCAsmBackend *llvm::createX86_64AsmBackend(const Target &T,
                                            const MCRegisterInfo &MRI,
-                                           StringRef TT,
+                                           const Triple &TheTriple,
                                            StringRef CPU) {
-  Triple TheTriple(TT);
-
   if (TheTriple.isOSBinFormatMachO()) {
     MachO::CPUSubTypeX86 CS =
         StringSwitch<MachO::CPUSubTypeX86>(TheTriple.getArchName())
Index: lib/Target/X86/MCTargetDesc/X86MCTargetDesc.h
===================================================================
--- lib/Target/X86/MCTargetDesc/X86MCTargetDesc.h
+++ lib/Target/X86/MCTargetDesc/X86MCTargetDesc.h
@@ -69,9 +69,9 @@
                                       MCContext &Ctx);
 
 MCAsmBackend *createX86_32AsmBackend(const Target &T, const MCRegisterInfo &MRI,
-                                     StringRef TT, StringRef CPU);
+                                     const Triple &TT, StringRef CPU);
 MCAsmBackend *createX86_64AsmBackend(const Target &T, const MCRegisterInfo &MRI,
-                                     StringRef TT, StringRef CPU);
+                                     const Triple &TT, StringRef CPU);
 
 /// Construct an X86 Windows COFF machine code streamer which will generate
 /// PE/COFF format object files.