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

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fanju110 wrote:

> @fanju110
> 
> The PR caused some buildbot failures, so I have [reverted](https://github.com/llvm/llvm-project/commit/597340b5b666bdee2887f56c111407b6737cbf34) it. You can see the error [here](https://lab.llvm.org/buildbot/#/builders/203/builds/12089/steps/7/logs/stdio).

I'm very sorry for this trouble.I'll check carefully and fix it before submitting again.  

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