[llvm] [AMDGCN][SIWholeQuadMode] Handle case when SI_KILL_I1_TERMINATOR -1,0 is not the only terminator (PR #122922)

[Jay Foad via llvm-commits]

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@@ -777,11 +777,19 @@ void SIWholeQuadMode::splitBlock(MachineInstr *TermMI) {
   case AMDGPU::S_MOV_B64:
     NewOpcode = AMDGPU::S_MOV_B64_term;
     break;
-  default:
+  case AMDGPU::S_ANDN2_B32:
+    NewOpcode = AMDGPU::S_ANDN2_B32_term;
+    break;
+  case AMDGPU::S_ANDN2_B64:
+    NewOpcode = AMDGPU::S_ANDN2_B64_term;
     break;
+  default:
+    llvm_unreachable("Unexpected instruction");
   }
-  if (NewOpcode)
-    TermMI->setDesc(TII->get(NewOpcode));
+
+  // these terminators fallthrough to the next block, no need to add an
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jayfoad wrote:

Nit: Comments should be full sentences with capital letter and period.

https://github.com/llvm/llvm-project/pull/122922