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

[Rahman Lavaee via llvm-commits]

https://github.com/rlavaee commented:

Thanks for addressing my concerns.

I wonder if there is any benefit in emitting the PGOAnalysis BB entries next to their BBAddrMap counterparts in the section. I see we are using the Metadata field to emit the successor type (used primarily for succinct decoding/encoding), but we probably shouldn't introduce this kind of coupling.

Here is an alternative:
Emit the entire PGOAnalysisMap entry of each function right after its BBAddrMap (NBlocks and Feature are shared). Define and use your own fancy encoding for successor type and count. 

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