[llvm] [SPIR-V] Avoid dead OpLogicalOr with false in legalizeIsFPClass (PR #216639)

[Juan Manuel Martinez Caamaño via llvm-commits]

https://github.com/jmmartinez commented:

I've added more reviewers since we will likely find other places like this logical or fold.

Do we want to add a separate peephole pass in the spirv backend that folds these kind of constructs? Or do we keep it simple?

https://github.com/llvm/llvm-project/pull/216639