[llvm] [SPIR-V] Simplify i1 comparisons before expanding to logical ops (PR #214638)

[Arseniy Obolenskiy via llvm-commits]

aobolensk wrote:

I think, you're right, this should remain a prat of the optimized pipeline. Yes, -O1+ already does that. Closing 

https://github.com/llvm/llvm-project/pull/214638