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

[Kiran Chandramohan via cfe-commits]

kiranchandramohan wrote:

> > Thank you for seeing this through and making all the little changes. I have requested reviews from @MaskRay and @aeubanks for the clang side of things.
> 
> hello,I noticed that this PR has been awaiting clang review for three weeks. I still haven't gotten a comment from them.would it be possible for you to suggest others who might be available to help review? Thanks

Adding @AaronBallman for reviewing the clang side or to suggest a suitable reviewer.

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