[llvm] [GIsel] Use changeElementType for cond types in LegalizerHelper (PR #193049)

[Alex MacLean via llvm-commits]

AlexMaclean wrote:

> Shouldn't this be `changeElementType(LLT::integer(1))`? Not generic scalar? For boolean results?

Sure, I've updated to use this. Do you know if it will matter at all in practice? 

https://github.com/llvm/llvm-project/pull/193049