[llvm] [AMDGPU] Handle non-register operands for S_SUB/ADD_U64_PSEUDO (PR #86104)

[Matt Arsenault via llvm-commits]

arsenm wrote:

> > Missing test
> 
> How can I test ISel pseudo expansion? I didn't find the tests for it

Ideally there would be a test that generated the failing pseudo in the first place, but you can also just run finalize-isel on MIR 


https://github.com/llvm/llvm-project/pull/86104