[clang] [llvm] [InstrPGO] Support cold function coverage instrumentation (PR #109837)

[Abhina Sree via llvm-commits]

abhina-sree wrote:

Hi, this PR is causing a regression on the AIX bot here https://lab.llvm.org/buildbot/#/builders/64/builds/1321/steps/6/logs/FAIL__Clang__pgo-cold-function-coverage_c. Would you be able to take a look? I think it can be resolved by using clang_cc1 in the testcase of marking it unsupported for AIX (see https://github.com/llvm/llvm-project/commit/951919e5112cabbd63c7a3bf424736efca81d964)

https://github.com/llvm/llvm-project/pull/109837