[llvm] [LoadStoreVectorizer] Avoid vectorizing pointers with external state (PR #209909)

[Drew Kersnar via llvm-commits]

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dakersnar wrote:

Yeah, like you said, this would already be skipped regardless of this PR's additional filter. We could add an additional test in case the pointer vector filter is relaxed in the future, but I'll note that hasExternalState does examine the scalar type, so it would successfully catch those cases. If you think it would be a good idea I can do it.

https://github.com/llvm/llvm-project/pull/209909