[llvm] [CodeGen] [AMDGPU] Adds pre-commit test for fmul-select combine (PR #111107)

[Matt Arsenault via llvm-commits]

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+; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py UTC_ARGS: --version 5
+;RUN: llc < %s -mtriple=amdgcn-amd-amdhsa -mcpu=gfx900 -verify-machineinstrs | FileCheck -check-prefix=GFX9 %s
+;RUN: llc < %s -mtriple=amdgcn-amd-amdhsa -mcpu=gfx1030 -verify-machineinstrs | FileCheck -check-prefix=GFX1030 %s
+;RUN: llc < %s -mtriple=amdgcn-amd-amdhsa -mcpu=gfx1100 -verify-machineinstrs | FileCheck -check-prefix=GFX1100 %s
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arsenm wrote:

```suggestion
 ;RUN: llc -mtriple=amdgcn-amd-amdhsa -mcpu=gfx900 < %s | FileCheck -check-prefix=GFX9 %s
; RUN: llc-mtriple=amdgcn-amd-amdhsa -mcpu=gfx1030 < %s | FileCheck -check-prefix=GFX1030 %s
; RUN: llc -mtriple=amdgcn-amd-amdhsa -mcpu=gfx1100 < %s | FileCheck -check-prefix=GFX1100 %s
```

https://github.com/llvm/llvm-project/pull/111107