[llvm] AMDGPU: Migrate more tests away from undef (PR #131314)

[Pierre van Houtryve via llvm-commits]

================
@@ -2,12 +2,28 @@
 ; RUN: llc -mtriple=amdgcn -mcpu=tonga -verify-machineinstrs < %s | FileCheck -check-prefix=SI %s
 
 ; SILowerI1Copies was not handling IMPLICIT_DEF
-; SI-LABEL: {{^}}br_implicit_def:
+; SI-LABEL: {{^}}br_poison:
 ; SI: %bb.0:
 ; SI-NEXT: s_cbranch_scc1
-define amdgpu_kernel void @br_implicit_def(ptr addrspace(1) %out, i32 %arg) #0 {
+define amdgpu_kernel void @br_poison(ptr addrspace(1) %out, i32 %arg) #0 {
----------------
Pierre-vh wrote:

It'd be nice to autogenerate this test, otherwise I find it hard to tell what it's even doing


https://github.com/llvm/llvm-project/pull/131314