[llvm] [SampleFDO][TypeProf]Support vtable type profiling for ext-binary and text format (PR #148002)

[Paschalis Mpeis via llvm-commits]

https://github.com/paschalis-mpeis commented:

Thanks for this work. I'm having a look at the RFC.
Posting a couple of nits here.

https://github.com/llvm/llvm-project/pull/148002