[llvm] Implements PGOBBAddrMap in Object and ObjectYAML with tests [1/5] (PR #71750)

[James Henderson via llvm-commits]

jh7370 wrote:

I've added @rlavaee as a reviewer, as they've done a lot of the work for the BB support in the various tools. I think it makes most sense for him to do the high-level review of this.

https://github.com/llvm/llvm-project/pull/71750