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

[Diana Picus via llvm-commits]

rovka wrote:

Hi @shiltian, I think this change introduced some failures on [this buildbot](https://lab.llvm.org/buildbot/#/builders/16/builds/15106), which went unnoticed because it was [already red](https://lab.llvm.org/buildbot/#/builders/16/builds/15105). Could you please have a look? :)

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