[llvm] [LAA] Don't assume libcalls with output/input pointers can be vectorized (PR #108980)

[Florian Hahn via llvm-commits]

https://github.com/fhahn approved this pull request.

LGTM as an initial fix. Would still be good to clarify the expected behavior with vector libs and errno.

https://github.com/llvm/llvm-project/pull/108980