[llvm] [VectorCombine] Support multiple uses of shuffled ops (PR #173183)

[Simon Pilgrim via llvm-commits]

https://github.com/RKSimon requested changes to this pull request.

(style) don't clang-format lines that are irrelevant to the change - it makes the patch almost impossible to review - there should only be changes inside foldShuffleOfIntrinsics

https://github.com/llvm/llvm-project/pull/173183