[llvm] Fix: Distinguish CFI Metadata Checks in MergeFunctions Pass (PR #65963)

[Oskar Wirga via llvm-commits]

oskarwirga wrote:

Looking good! I don't have merge access so once it becomes to @nikic  and @dexonsmith's standards I would appreciate a merge :)

https://github.com/llvm/llvm-project/pull/65963