[llvm] VectorCombine: lift one-use limitation in foldExtractedCmps (PR #110902)

[Simon Pilgrim via llvm-commits]

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

LGTM with one minor (and I tweaked the PR title to mention foldExtractedCmps)

https://github.com/llvm/llvm-project/pull/110902