[InstCombine] Fold (X + C) + (Y & ~C) to X + (Y | C) (#191334) Add an InstCombine fold for masked overwrite patterns where the add constant matches the cleared bits in the mask: (X + C) + (Y & ~C) -> X + (Y | C) Since `Y & ~C` clears all bits set in C, adding C cannot generate carry through those bits and is equivalent to setting them with `or`. Proof: https://alive2.llvm.org/ce/z/277UFK Fixed: https://github.com/llvm/llvm-project/issues/191171
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