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Add PGO support at -O0 in the experimental new pass manager to sync the behavior of 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 compilation is tested. Differential Revision: https://reviews.llvm.org/D64029 llvm-svn: 367628