[llvm] [AMDGPU][LIT] Added a MIR LIT showing the SGPR spills (PR #94584)

[Matt Arsenault via llvm-commits]

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+# NOTE: Assertions have been autogenerated by utils/update_mir_test_checks.py UTC_ARGS: --version 5
+# RUN: llc -mtriple=amdgcn-amd-amdhsa -mcpu=gfx908 -verify-machineinstrs -stress-regalloc=3 -start-before=greedy -stop-after=si-lower-sgpr-spills -o - %s | FileCheck -check-prefix=SGPR_SPILLED %s
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arsenm wrote:

There are multiple regalloc runs. The VGPR allocation should not matter here, so you should be able to start after it. You probably want -start-after=virtregrewriter,0 

https://github.com/llvm/llvm-project/pull/94584