[llvm] [llvm-profgen] Support creating profiles of arbitrary events (PR #99026)

[Wei Xiao via llvm-commits]

williamweixiao wrote:

Hi @tcreech-intel you can mention that this enhancement is for HWPGO (https://llvm.org/devmtg/2024-04/slides/TechnicalTalks/Xiao-EnablingHW-BasedPGO.pdf) to support a wide range of hardware events in the future.

https://github.com/llvm/llvm-project/pull/99026