[llvm] [GVN][NewGVN][Local] Handle attributes for function calls after CSE (PR #114011)

[via llvm-commits]

goldsteinn wrote:

This looks fine to me, although I think an easier way to implement this would be make `patchReplacementInstruction` return a bool to indicate `I` and `Repl` where successfully patched.

https://github.com/llvm/llvm-project/pull/114011