[clang] [IRPGO][ValueProfile] Instrument virtual table address that could be used to do virtual table address comparision for indirect-call-promotion. (PR #66825)

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WenleiHe wrote:

Haven't looked at the changes, but from the conversations above this looks like a useful change. Though I think the big picture context/motivation can go into the change summary to help others understand better. Maybe even a small RFC would be helpful to explain the complete plan you have. 

> combined with more aggressive interprocedural type propagation that enables full (unconditional) devirtualization

Today LLVM doesn't have inter-procedural type propagation yet, right? or is this something you started working on now? 

https://github.com/llvm/llvm-project/pull/66825