[llvm] [SPIR-V] Allow NoUnsignedWrap decoration on OpShiftLeftLogical (PR #206155)

[Juan Manuel Martinez Caamaño via llvm-commits]

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jmmartinez wrote:

Should we remove `OpSNegate` from here then?

TBH, I don't think it hurts to have it still in `canUseNUW` (but I get it's odd). Should we merge these 2 helpers since they converged?

https://github.com/llvm/llvm-project/pull/206155