[llvm] [FunctionAttrs] Handle alias-preserving intrinsic calls correctly (PR #68453)

[Krzysztof Drewniak via llvm-commits]

krzysz00 wrote:

Ah, in which case, I'll file a separate commit to fix up the annotations on the intrinsic and leave this as a precision enhancement

https://github.com/llvm/llvm-project/pull/68453