[PATCH] D130807: [InstrProf] Add the omitprofile attribute

[Ellis Hoag via Phabricator via cfe-commits]

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As discussed in [0], this diff adds the `omitprofile` attribute to
prevent the function from being profiled while allowing profiled
functions to be inlined into it. The `noprofile` attribute remains
unchanged.

The `noprofile` attribute is used for functions where it is
dangerous to add instrumentation to while the `omitprofile` attribute is
used to reduce code size or performance overhead.

[0] https://discourse.llvm.org/t/why-does-the-noprofile-attribute-restrict-inlining/64108


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D130807

Files:
  clang/lib/CodeGen/CodeGenFunction.h
  clang/lib/CodeGen/CodeGenPGO.cpp
  clang/test/CodeGen/profile-function-groups.c
  llvm/docs/LangRef.rst
  llvm/include/llvm/Bitcode/LLVMBitCodes.h
  llvm/include/llvm/IR/Attributes.td
  llvm/lib/Bitcode/Reader/BitcodeReader.cpp
  llvm/lib/Bitcode/Writer/BitcodeWriter.cpp
  llvm/lib/Transforms/Instrumentation/GCOVProfiling.cpp
  llvm/lib/Transforms/Instrumentation/PGOInstrumentation.cpp
  llvm/lib/Transforms/Utils/CodeExtractor.cpp
  llvm/test/Bitcode/attributes.ll
  llvm/test/Transforms/GCOVProfiling/noprofile.ll
  llvm/test/Transforms/PGOProfile/noprofile.ll

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