[clang, test] Fix Clang :: Headers/max_align.c on 64-bit SPARC

[ro]

Summary

Clang :: Headers/max_align.c currently FAILs on 64-bit SPARC:

error: 'error' diagnostics seen but not expected: 
  File /vol/llvm/src/clang/dist/test/Headers/max_align.c Line 12: static_assert failed due to requirement '8 == _Alignof(max_align_t)' ""
1 error generated.

This happens because SuitableAlign isn't defined for SPARCv9 unlike SPARCv8
(which uses the default of 64 bits). gcc's sparc/sparc.h has

#define BIGGEST_ALIGNMENT (TARGET_ARCH64 ? 128 : 64)

This patch sets SuitableAlign to match and updates the corresponding testcase.

Tested on sparcv9-sun-solaris2.11 . Ok for trunk?

[ro]

Ping? It's been a week.

[ro]

Ping^2? It's been two weeks now.

[jyknight]

LGTM.

lib/Basic/Targets/Sparc.h

SparcV9TargetInfo(const llvm::Triple &Triple, const TargetOptions &Opts)
     else
       IntMaxType = SignedLong;
     Int64Type = IntMaxType;
 
     // The SPARCv8 System V ABI has long double 128-bits in size, but 64-bit
     // aligned. The SPARCv9 SCD 2.4.1 says 16-byte aligned.
     LongDoubleWidth = 128;
     LongDoubleAlign = 128;
+    SuitableAlign = 128;
     LongDoubleFormat = &llvm::APFloat::IEEEquad();
     MaxAtomicPromoteWidth = MaxAtomicInlineWidth = 64;
   }
 
   void getTargetDefines(const LangOptions &Opts,
                         MacroBuilder &Builder) const override;
 
   bool isValidCPUName(StringRef Name) const override {

test/Preprocessor/init.c

 // RUN: %clang_cc1 -x c++ -E -dM -ffreestanding -triple=x86_64-scei-ps4 < /dev/null | FileCheck -match-full-lines -check-prefix PS4-CXX %s
 // PS4-CXX:#define __STDCPP_DEFAULT_NEW_ALIGNMENT__ 32UL
 //
 // RUN: %clang_cc1 -E -dM -triple=x86_64-pc-mingw32 < /dev/null | FileCheck -match-full-lines -check-prefix X86-64-DECLSPEC %s
 // RUN: %clang_cc1 -E -dM -fms-extensions -triple=x86_64-unknown-mingw32 < /dev/null | FileCheck -match-full-lines -check-prefix X86-64-DECLSPEC %s
 // X86-64-DECLSPEC: #define __declspec{{.*}}
 //
 // RUN: %clang_cc1 -E -dM -ffreestanding -triple=sparc64-none-none < /dev/null | FileCheck -match-full-lines -check-prefix SPARCV9 %s
+// SPARCV9:#define __BIGGEST_ALIGNMENT__ 16
 // SPARCV9:#define __INT64_TYPE__ long int
 // SPARCV9:#define __INTMAX_C_SUFFIX__ L
 // SPARCV9:#define __INTMAX_TYPE__ long int
 // SPARCV9:#define __INTPTR_TYPE__ long int
 // SPARCV9:#define __LONG_MAX__ 9223372036854775807L
 // SPARCV9:#define __LP64__ 1
 // SPARCV9:#define __SIZEOF_LONG__ 8
 // SPARCV9:#define __SIZEOF_POINTER__ 8