[llvm] [AMDGPU] Use 32-bit SGPR to save/restore of SCC (PR #68367)

[Sirish Pande via llvm-commits]

================
@@ -0,0 +1,87 @@
+; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py UTC_ARGS: --version 3
+; RUN:  llc -march=amdgcn -mcpu=gfx906 -verify-machineinstrs < %s | FileCheck -check-prefix=GFX906 %s
----------------
srpande wrote:

I added two mir  tests, one for 906 (wave64) and one for 1030 (wave32 in the new patch.
I also removed the larger IR test. I will put that test as a part of another patch (https://github.com/llvm/llvm-project/pull/68363) once this is committed.

https://github.com/llvm/llvm-project/pull/68367