[llvm] [llvm][IR] Extend BranchWeightMetadata to track provenance of weights (PR #86609)

[Paul Kirth via llvm-commits]

ilovepi wrote:

Yeah, if this is changing .text, then lets revert for now, and we can reland after we fix that. I'm stuck in meetings for the next few hours, so if you can, push the revert, I'd appreciate the favor. Otherwise, I can do it later in the afternoon.


https://github.com/llvm/llvm-project/pull/86609