[llvm] [llvm-utils][Tools] fix mir-check filter to handle scattered check-lines (PR #209226)

[Matt Arsenault via llvm-commits]

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arsenm wrote:

```suggestion
# RUN: llc -mtriple=amdgpu10.10 -run-pass=machine-sink -o - %s | FileCheck -check-prefixes=GFX10 %s
```

https://github.com/llvm/llvm-project/pull/209226