AMDGPU: Switch a test with only function label checks to generated

I suspect the first function at least is not usefully testing
the original failure.

Author: arsenm

llvm/test/CodeGen/AMDGPU/subreg-coalescer-crash.ll

@@ -1,8 +1,13 @@
-; RUN: llc -mtriple=amdgcn -mcpu=tahiti -verify-machineinstrs -o - %s | FileCheck -check-prefix=GCN %s
-; RUN: llc -mtriple=amdgcn -mcpu=tonga -verify-machineinstrs -o - %s | FileCheck -check-prefix=GCN %s
+; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py UTC_ARGS: --version 5
+; RUN: llc -mtriple=amdgcn -mcpu=tahiti -o - %s | FileCheck -check-prefixes=GCN,GFX6 %s
+; RUN: llc -mtriple=amdgcn -mcpu=tonga -o - %s | FileCheck -check-prefixes=GCN,GFX8 %s
 
-; GCN-LABEL:{{^}}row_filter_C1_D0:
 define amdgpu_kernel void @row_filter_C1_D0() #0 {
+; GCN-LABEL: row_filter_C1_D0:
+; GCN:       ; %bb.0: ; %entry
+; GCN-NEXT:    s_cbranch_scc1 .LBB0_2
+; GCN-NEXT:  ; %bb.1: ; %do.body.preheader
+; GCN-NEXT:  .LBB0_2: ; %for.inc.1
 entry:
   br i1 undef, label %for.inc.1, label %do.body.preheader
 
@@ -40,9 +45,28 @@ for.inc.1:                                        ; preds = %do.body.1562.prehea
   unreachable
 }
 
-; GCN-LABEL: {{^}}foo:
-; GCN: s_endpgm
 define amdgpu_ps void @foo() #0 {
+; GCN-LABEL: foo:
+; GCN:       ; %bb.0: ; %bb
+; GCN-NEXT:    s_mov_b64 s[0:1], -1
+; GCN-NEXT:    s_cbranch_scc0 .LBB1_2
+; GCN-NEXT:  ; %bb.1: ; %bb24
+; GCN-NEXT:    s_mov_b64 s[0:1], 0
+; GCN-NEXT:  .LBB1_2: ; %Flow1
+; GCN-NEXT:    s_and_b64 vcc, exec, s[0:1]
+; GCN-NEXT:    s_cbranch_vccz .LBB1_4
+; GCN-NEXT:  ; %bb.3: ; %bb9
+; GCN-NEXT:    image_sample v[0:1], v0, s[0:7], s[0:3] dmask:0xa
+; GCN-NEXT:    s_branch .LBB1_5
+; GCN-NEXT:  .LBB1_4:
+; GCN-NEXT:    v_mov_b32_e32 v1, 0
+; GCN-NEXT:    v_mov_b32_e32 v0, v1
+; GCN-NEXT:  .LBB1_5: ; %bb14
+; GCN-NEXT:    s_waitcnt vmcnt(0)
+; GCN-NEXT:    v_mul_f32_e32 v0, 0x41280000, v0
+; GCN-NEXT:    v_mul_f32_e32 v1, 0x41380000, v1
+; GCN-NEXT:    exp mrt0 v1, v0, v0, v0 done vm
+; GCN-NEXT:    s_endpgm
 bb:
   br i1 undef, label %bb2, label %bb1
 
@@ -101,3 +125,6 @@ declare <4 x float> @llvm.amdgcn.image.sample.1d.v4f32.f32(i32, float, <8 x i32>
 
 attributes #0 = { nounwind }
 attributes #1 = { nounwind readonly }
+;; NOTE: These prefixes are unused and the list is autogenerated. Do not add tests below this line:
+; GFX6: {{.*}}
+; GFX8: {{.*}}