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

[James Henderson via llvm-commits]

jh7370 wrote:

It's going to be a bit of a pain to review this with it including the old version support dropping changes too, so I'm going to hold off reviewing until that has landed and you've rebased.

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