[clang] [Clang][Sema] Fix last argument not being used when comparing function template specializations when one has an explicit object argument (PR #92263)

[Mital Ashok via cfe-commits]

MitalAshok wrote:

@Sirraide Oh I didn't see the conflict, thanks. It should be fine now?

https://github.com/llvm/llvm-project/pull/92263