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

[Oskar Wirga via llvm-commits]

oskarwirga wrote:

@nikic @dexonsmith Again thank you for your feedback on this! I've yet to have write access so I'll ask one of you to merge this. :) 

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