[llvm] AMDGPU: Pre-commit test to verify mode change in fp constrained operations (PR #88858)

[Matt Arsenault via llvm-commits]

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@@ -0,0 +1,43 @@
+; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py UTC_ARGS: --version 4
+; RUN: llc -mtriple=amdgcn-amd-amdhsa -mcpu=gfx900 -verify-machineinstrs %s -o - | FileCheck -check-prefix=GCN %s
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arsenm wrote:

```suggestion
; RUN: llc -mtriple=amdgcn-amd-amdhsa -mcpu=gfx900 %s -o - | FileCheck -check-prefix=GCN %s
```

https://github.com/llvm/llvm-project/pull/88858