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

[Matt Arsenault via llvm-commits]

================
@@ -0,0 +1,1191 @@
+; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py UTC_ARGS: --version 5
+;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
+
+define float @fmul_select_f32_test1(float %x, i32 %bool.arg1, i32 %bool.arg2) {
----------------
arsenm wrote:

```define float @s_fmul_select_f32_test1(float inreg %x, i32 inreg %bool.arg1, i32 inreg %bool.arg2) {```

(Could also replace bool.arg2 with a constant everywhere) 



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