[PATCH] D101129: [gcov] Set nounwind and respect module flags metadata "frame-pointer" & "uwtable" for synthesized functions

[Fangrui Song via Phabricator via llvm-commits]

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This applies the D100251 <https://reviews.llvm.org/D100251> mechanism to the gcov instrumentation pass.

With this patch, `-fno-omit-frame-pointer` in
`clang -fprofile-arcs -O1 -fno-omit-frame-pointer` will be respected for synthesized
`__llvm_gcov_writeout,__llvm_gcov_reset,__llvm_gcov_init` functions: the frame pointer
will be kept (note: on many targets -O1 eliminates the frame pointer by default).

`clang -fno-exceptions -fno-asynchronous-unwind-tables -g -fsanitize=address` will
produce .debug_frame instead of .eh_frame.

Fix: https://github.com/ClangBuiltLinux/linux/issues/955


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D101129

Files:
  llvm/lib/Transforms/Instrumentation/GCOVProfiling.cpp
  llvm/test/Transforms/GCOVProfiling/function-numbering.ll
  llvm/test/Transforms/GCOVProfiling/module-flags.ll

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