[llvm] [AMDGPU] (x or y) xor -1 -> x nor y (PR #130264)

[Matt Arsenault via llvm-commits]

arsenm wrote:

> The problem I have here is that if I am using ballot 

Ballot is not core to the pattern here, the ballot tests should be separate

https://github.com/llvm/llvm-project/pull/130264