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

[Jay Foad via llvm-commits]

jayfoad 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?

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