[llvm] [AMDGPU] misched: avoid subregister dependencies (PR #140255)

[Matt Arsenault via llvm-commits]

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@@ -0,0 +1,973 @@
+# RUN: llc -mtriple=amdgcn -mcpu=gfx942 -start-before=machine-scheduler -verify-misched -misched-print-dags -stop-after=machine-scheduler -filetype=null %s 2>&1 | FileCheck -check-prefix=GCN %s
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arsenm wrote:

```suggestion
# REQUIRES: asserts
# RUN: llc -mtriple=amdgcn -mcpu=gfx942 -start-before=machine-scheduler -verify-misched -misched-print-dags -stop-after=machine-scheduler -filetype=null %s 2>&1 | FileCheck -check-prefix=GCN %s
```

https://github.com/llvm/llvm-project/pull/140255