[llvm] [StaticDataLayout][PGO]Implement reader and writer change for data access profiles (PR #139997)

[Snehasish Kumar via llvm-commits]

snehasish wrote:

Would you be able to share a draft patch of the current implementation? It would help me come up with concrete suggestions on how to proceed and reduce unneccessary churn.

https://github.com/llvm/llvm-project/pull/139997