[llvm] [SHT_LLVM_BB_ADDR_MAP] Emit callsite offsets in the `SHT_LLVM_BB_ADDR_MAP` section. (PR #146563)

[James Henderson via llvm-commits]

https://github.com/jh7370 commented:

So turns out this is mostly outside my expertise. Got a couple of documentation nits, but those more knowledgeable about CodeGen will need to review this.

https://github.com/llvm/llvm-project/pull/146563