[llvm] [MachineVerifier](NFC)(TestOnly) Canonicalise top-level MachineVerifier tests (PR #172527)

[Matt Arsenault via llvm-commits]

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@@ -1,11 +1,9 @@
-# RUN: not --crash llc -mtriple=aarch64 -o /dev/null -run-pass=none -verify-machineinstrs %s 2>&1 | FileCheck %s
+# RUN: not --crash llc -mtriple=aarch64 -global-isel -run-pass=none -filetype=null %s 2>&1 | FileCheck %s
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arsenm wrote:

```suggestion
# RUN: not --crash llc -mtriple=aarch64 -run-pass=none -filetype=null %s 2>&1 | FileCheck %s
```

No MIR test needs -global-isel, but this is adding many new uses 

https://github.com/llvm/llvm-project/pull/172527