[llvm] [InstCombine] Relax one-use requirement for add iN (sext i1 X), (sext i1 Y) --> sext (X | Y) to iN (PR #90509)

[via llvm-commits]

AtariDreams wrote:

> The the title should the "Relax one-use..." instead of "Remove one-use..."

Fixed!

https://github.com/llvm/llvm-project/pull/90509