goldsteinn cc995ad064 [InstSimpify] Simplifying (xor (sub C_Mask, X), C_Mask) -> X (#122552) ...

- **[InstSimpify] Add tests for simplifying `(xor (sub C_Mask, X),
C_Mask)`; NFC**
- **[InstSimpify] Simplifying `(xor (sub C_Mask, X), C_Mask)` -> `X`**

Helps address regressions with folding `clz(Pow2)`.

Proof: https://alive2.llvm.org/ce/z/zGwUBp

2025-01-11 15:10:42 -06:00

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