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

[Valery Pykhtin via cfe-commits]

vpykhtin wrote:

> Though, on second thought, shouldn't there be some wave64 tests?

I added a couple of ballot.i64 in wave32 mode tests to AMDGPU/GlobalISel/llvm.amdgcn.ballot.i32.ll and AMDGPU/llvm.amdgcn.ballot.i32.ll with the https://github.com/llvm/llvm-project/pull/68714/commits/6e865d146af0236ff42c53b6a96c01b23fe3c096

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