[llvm] [VPlan] Extend cse to eliminate redundant widened loads (PR #212543)

[Ramkumar Ramachandra via llvm-commits]

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+; NOTE: Assertions have been autogenerated by utils/update_test_checks.py UTC_ARGS: --check-globals none --version 6
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artagnon wrote:

I think you can remove the newly-added IR tests now, as the VPlan tests already cover it?

https://github.com/llvm/llvm-project/pull/212543