[llvm] [InstSimplify] Simplify the expression `(a^c)&(a^~c)` to zero (PR #76637)

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ChipsSpectre wrote:

> Please add support for the conjugate or pattern at the same time.

Can you explain what you mean with this? 
I assume that you suggest adding support for the "or" pattern, i.e. `(a ^ c1) | (a ^ c2) -> -1` and would add this.

https://github.com/llvm/llvm-project/pull/76637