[llvm] [llvm] Remove `br i1 undef` in `llvm/test/CodeGen` tests (PR #127368)

[via llvm-commits]

================
@@ -10,9 +10,9 @@
 ;
 ; GCN: s_endpgm
 
-define amdgpu_ps void @main(i32 %in1) local_unnamed_addr {
+define amdgpu_ps void @main(i32 %in1, i1 %arg) local_unnamed_addr {
 .entry:
-  br i1 undef, label %bb12, label %bb
+  br i1 %arg, label %bb12, label %bb
----------------
Yeaseen wrote:

@arsenm Thanks for the review. The following changes work fine.

```
define amdgpu_ps void @main(i32 %in1, i32 inreg %arg) local_unnamed_addr {
.entry:
  %cond = icmp eq i32 %arg, 0
  br i1 %cond, label %bb12, label %bb
```

If this is okay, I will update this in the next PR.

https://github.com/llvm/llvm-project/pull/127368