[llvm] [FunctionComparator] Differentiate instructions passing distinct MDStrings (PR #69543)

[Nuri Amari via llvm-commits]

NuriAmari wrote:

There are a couple related patches: https://github.com/llvm/llvm-project/pull/65963, https://github.com/llvm/llvm-project/commit/8325d46a4ab803c6eeff28bf1bdafb43287ce557, but they don't solve this problem.

https://github.com/llvm/llvm-project/pull/69543