[llvm] [VectorCombine] Fix crash when folding select of bitcast (PR #177183)

[Mitch Briles via llvm-commits]

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+; NOTE: Assertions have been autogenerated by utils/update_test_checks.py UTC_ARGS: --version 6
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MitchBriles wrote:

Ah, I suspected that might be it. I moved the tests and added some more selects.

https://github.com/llvm/llvm-project/pull/177183