[PATCH] D143094: [clang] Change AMX macros to match names from GCC

[Joe Loser via Phabricator via cfe-commits]

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The current behavior for AMX macros is:

  gcc -march=native -dM -E - < /dev/null | grep TILE
  
  clang -march=native -dM -E - < /dev/null | grep TILE

which is not ideal.  Change `__AMXTILE__` and friends to `__AMX_TILE__` (i.e.
have an underscore in them).  This makes GCC and Clang agree on the naming of
these AMX macros to simplify downstream user code.

Fix this for `__AMXTILE__`, `__AMX_INT8__`, `__AMX_BF16__`, and `__AMX_FP16__`.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D143094

Files:
  clang/lib/Basic/Targets/X86.cpp
  clang/lib/Headers/immintrin.h
  clang/test/Preprocessor/predefined-arch-macros.c
  clang/test/Preprocessor/x86_amx_target_features.c
  clang/test/Preprocessor/x86_target_features.c

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