Reapply "[llvm][IR] Extend BranchWeightMetadata to track provenance of weights"#95136

ilovepi wants to merge 1 commit intomainllvm/llvm-project:mainfrom

revert-95060-revert-86609-users/ilovepi/spr/llvmir-extend-branchweightmetadata-to-track-provenance-of-weightsllvm/llvm-project:revert-95060-revert-86609-users/ilovepi/spr/llvmir-extend-branchweightmetadata-to-track-provenance-of-weightsCopy head branch name to clipboard