[PATCH] D64029: [PGO] Add PGO support at -O0 in the experimental new pass manager

[Rong Xu via Phabricator via cfe-commits]

xur created this revision.
xur added a reviewer: chandlerc.
Herald added a subscriber: hiraditya.
Herald added a project: LLVM.

Add PGO support at -O0 in the experimental new pass manager to sync the behavior with the legacy pass manager.

Also change the test of gcc-flag-compatibility.c for more complete test:
(1) change the match string to "profc" and "profd" to ensure the instrumentation is happening.
(2) add IR format proftext so that PGO use is tested.


https://reviews.llvm.org/D64029

Files:
  clang/lib/CodeGen/BackendUtil.cpp
  clang/test/Profile/Inputs/gcc-flag-compatibility_IR.proftext
  clang/test/Profile/gcc-flag-compatibility.c
  llvm/include/llvm/Passes/PassBuilder.h
  llvm/lib/Passes/PassBuilder.cpp

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