[clang] [flang] [llvm] Add IR Profile-Guided Optimization (IR PGO) support to the Flang compiler (PR #136098)

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fanju110 wrote:




> @fanju110, Thanks for seeing this through!

Hi @tarunprabhu , If everything looks good, could you please merge this PR at your convenience (I don't have merge rights)? Thank you!

https://github.com/llvm/llvm-project/pull/136098