[llvm] [clang] [clang-tools-extra] Improve selection of conditional branch on amdgcn.ballot!=0 condition in SelectionDAG. (PR #68714)

[Nicolai Hähnle via cfe-commits]

nhaehnle wrote:

I meant ballot.i64 in wave64. For some reason, I didn't see the changes you made in those tests (perhaps I was looking at GitHub's display of your last changes to the PR, instead of the full PR.) But since you did make those changes, it's all good as far as I'm concerned.

https://github.com/llvm/llvm-project/pull/68714