[llvm] [SHT_LLVM_BB_ADDR_MAP] Add a new PGOAnalysisMap feature to emit dynamic instruction count (PR #119303)

[James Henderson via llvm-commits]

jh7370 wrote:

> The alternative is to define a new [extension](https://llvm.org/docs/Extensions.html) and implement the parsing/emitting logic separately. Since your structure is basically a map from function addresses to counts, it shouldn't be too hard to implement, though I agree you would need to add code in different places (ObjectYaml, Object, Codegen). @jh7370 may have an opinion here.

Sorry, I don't think I really have enough background understanding to be able to give an opinion on this topic.

https://github.com/llvm/llvm-project/pull/119303