[llvm-branch-commits] [llvm] [AMDGPU][test] Use mir test for regalloc issue (PR #197363)

[Quentin Colombet via llvm-branch-commits]

qcolombet wrote:

@arsenm this is the cleaned up version of the PR to be able to reproduce the spilling issue from a couple of weeks ago from a ~3k line of LLVM IR to ~20 lines of mir.

https://github.com/llvm/llvm-project/pull/197363