[Sparc] Create an error when `__builtin_longjmp` is used

[xtkoba]

Summary

For Sparc, the support for builtin setjmp/longjmp is removed by https://reviews.llvm.org/D51487. An error should be created when compiling a C code using __builtin_setjmp or __builtin_longjmp.

[dcederman]

LGTM.

clang/lib/Basic/Targets/Sparc.h

if (llvm::is_contained(Features, "+soft-float"))
       SoftFloat = true;
     return true;
   }
   void getTargetDefines(const LangOptions &Opts,
                         MacroBuilder &Builder) const override;
 
   bool hasFeature(StringRef Feature) const override;
 
-  bool hasSjLjLowering() const override { return true; }
-
   ArrayRef<Builtin::Info> getTargetBuiltins() const override {
     // FIXME: Implement!
     return None;
   }
   BuiltinVaListKind getBuiltinVaListKind() const override {
     return TargetInfo::VoidPtrBuiltinVaList;
   }
   ArrayRef<const char *> getGCCRegNames() const override;
else
       // FIXME: This isn't correct for plain V8 which lacks CAS,
       // only for LEON 3+ and Myriad.
       MaxAtomicInlineWidth = 32;
   }
 
   void getTargetDefines(const LangOptions &Opts,
                         MacroBuilder &Builder) const override;
 
-  bool hasSjLjLowering() const override { return true; }
   bool hasExtIntType() const override { return true; }
 };
 
 // SPARCV8el is the 32-bit little-endian mode selected by Triple::sparcel.
 class LLVM_LIBRARY_VISIBILITY SparcV8elTargetInfo : public SparcV8TargetInfo {
 public:
   SparcV8elTargetInfo(const llvm::Triple &Triple, const TargetOptions &Opts)
       : SparcV8TargetInfo(Triple, Opts) {

clang/test/Sema/builtin-longjmp.c

 // RUN: %clang_cc1 -triple i386-unknown-unknown -emit-llvm < %s| FileCheck %s
 // RUN: %clang_cc1 -triple x86_64-unknown-unknown -emit-llvm < %s| FileCheck %s
 // RUN: %clang_cc1 -triple x86_64-windows -emit-llvm < %s| FileCheck %s
 // RUN: %clang_cc1 -triple powerpc-unknown-unknown -emit-llvm < %s| FileCheck %s
 // RUN: %clang_cc1 -triple powerpc64-unknown-unknown -emit-llvm < %s| FileCheck %s
-// RUN: %clang_cc1 -triple sparc-eabi-unknown -emit-llvm < %s | FileCheck %s
 // RUN: %clang_cc1 -triple ve-unknown-unknown -emit-llvm < %s | FileCheck %s
 
 // RUN: %clang_cc1 -triple aarch64-unknown-unknown -emit-llvm-only -verify %s
 // RUN: %clang_cc1 -triple mips-unknown-unknown -emit-llvm-only -verify %s
 // RUN: %clang_cc1 -triple mips64-unknown-unknown -emit-llvm-only -verify %s
+// RUN: %clang_cc1 -triple sparc-eabi-unknown -emit-llvm-only -verify %s
 
 // Check that __builtin_longjmp and __builtin_setjmp are lowered into
 // IR intrinsics on those architectures that can handle them.
 // Check that an error is created otherwise.
 
 typedef void *jmp_buf;
 jmp_buf buf;