[llvm] [AMDGPU] Change SGPR layout to striped caller/callee saved (PR #127353)

[Shilei Tian via llvm-commits]

shiltian wrote:

> Is the test from #113782 buried somewhere in this giant test diff?

Yes. The check line of the test has been updated because it no longer crashes but another error was emitted. I'll fix the new issue in a follow up.

https://github.com/llvm/llvm-project/pull/127353