[llvm] [SampleFDO] Read call-graph matching recovered top-level function profile (PR #101053)

[Lei Wang via llvm-commits]

wlei-llvm wrote:

> Can you commit the pure refactoring part first?

Created a new PR: https://github.com/llvm/llvm-project/pull/104654

https://github.com/llvm/llvm-project/pull/101053