[llvm-branch-commits] [llvm] release/20.x: [DAGCombiner] Don't ignore N2's undef elements in `foldVSelectOfConstants` (#129272) (PR #129383)

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llvmbot wrote:

@RKSimon What do you think about merging this PR to the release branch?

https://github.com/llvm/llvm-project/pull/129383