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

[Micah Weston via llvm-commits]

red1bluelost wrote:

I went ahead and merged into this PR the design changes suggested @rlavaee. (I called it PGOAnalysisMap instead of PGOFrequencyMap). Using the same ELF section with the feature guard does help to simplify and shorten the code. If the user does not request the PGOAnalysisMap when decoding the BBAddrMap section then the code just ignores any extra data.

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