[llvm] [AMDGPU] Improve selection of ballot.i64 intrinsic in wave32 mode in SelectionDAG. (PR #71556)

[Valery Pykhtin via llvm-commits]

vpykhtin wrote:

> I would expect it to fail to select if the type does not match the wave size. Is there a real use case for it?

I would like to use ballot.i64 in both wave modes because I don't want to select bit width in AddressSanitizer code, it's relatively high in the pass chain and wave mode isn't readily available there.

https://github.com/llvm/llvm-project/pull/71556