Index: lib/Target/AArch64/AArch64MCInstLower.cpp
===================================================================
--- lib/Target/AArch64/AArch64MCInstLower.cpp
+++ lib/Target/AArch64/AArch64MCInstLower.cpp
@@ -168,8 +168,7 @@
   if (Printer.TM.getTargetTriple().isOSBinFormatCOFF())
     return lowerSymbolOperandCOFF(MO, Sym);
 
-  assert(Printer.TM.getTargetTriple().isOSBinFormatELF() &&
-         "Expect Darwin, ELF or COFF target");
+  assert(Printer.TM.getTargetTriple().isOSBinFormatELF() && "Invalid target");
   return lowerSymbolOperandELF(MO, Sym);
 }
 
Index: lib/Target/AArch64/AArch64RegisterInfo.cpp
===================================================================
--- lib/Target/AArch64/AArch64RegisterInfo.cpp
+++ lib/Target/AArch64/AArch64RegisterInfo.cpp
@@ -94,7 +94,7 @@
   if (TT.isOSDarwin())
     return CSR_AArch64_TLS_Darwin_RegMask;
 
-  assert(TT.isOSBinFormatELF() && "only expect Darwin or ELF TLS");
+  assert(TT.isOSBinFormatELF() && "Invalid target");
   return CSR_AArch64_TLS_ELF_RegMask;
 }
 
Index: lib/Target/AArch64/MCTargetDesc/AArch64AsmBackend.cpp
===================================================================
--- lib/Target/AArch64/MCTargetDesc/AArch64AsmBackend.cpp
+++ lib/Target/AArch64/MCTargetDesc/AArch64AsmBackend.cpp
@@ -590,8 +590,7 @@
   if (TheTriple.isOSBinFormatCOFF())
     return new COFFAArch64AsmBackend(T, TheTriple);
 
-  assert(TheTriple.isOSBinFormatELF() &&
-         "Expect either MachO, ELF or COFF target");
+  assert(TheTriple.isOSBinFormatELF() && "Invalid target");
 
   uint8_t OSABI = MCELFObjectTargetWriter::getOSABI(TheTriple.getOS());
   bool IsILP32 = Options.getABIName() == "ilp32";
Index: lib/Target/AArch64/MCTargetDesc/AArch64MCTargetDesc.cpp
===================================================================
--- lib/Target/AArch64/MCTargetDesc/AArch64MCTargetDesc.cpp
+++ lib/Target/AArch64/MCTargetDesc/AArch64MCTargetDesc.cpp
@@ -63,7 +63,7 @@
   else if (TheTriple.isOSBinFormatCOFF())
     MAI = new AArch64MCAsmInfoCOFF();
   else {
-    assert(TheTriple.isOSBinFormatELF() && "Only expect Darwin, ELF or COFF");
+    assert(TheTriple.isOSBinFormatELF() && "Invalid target");
     MAI = new AArch64MCAsmInfoELF(TheTriple);
   }
 
@@ -78,8 +78,7 @@
 static void adjustCodeGenOpts(const Triple &TT, Reloc::Model RM,
                               CodeModel::Model &CM) {
   assert((TT.isOSBinFormatELF() || TT.isOSBinFormatMachO() ||
-          TT.isOSBinFormatCOFF()) &&
-         "Only expect Darwin, ELF and COFF targets");
+          TT.isOSBinFormatCOFF()) && "Invalid target");
 
   if (CM == CodeModel::Default)
     CM = CodeModel::Small;