[turbofan] Merge dependent Word32Equal on ARM64

src/compiler/arm64/instruction-selector-arm64.cc

Index: src/compiler/arm64/instruction-selector-arm64.cc
diff --git a/src/compiler/arm64/instruction-selector-arm64.cc b/src/compiler/arm64/instruction-selector-arm64.cc
index 03dfd73a73a76f1111ad8988901f1a77b397f76c..f025bf2f427f7f8eb2b076a19c10af899cf61fe7 100644
--- a/src/compiler/arm64/instruction-selector-arm64.cc
+++ b/src/compiler/arm64/instruction-selector-arm64.cc
@@ -1877,6 +1877,14 @@ void InstructionSelector::VisitWord32Equal(Node* const node) {
         case IrOpcode::kWord32And:
           return VisitWordCompare(this, value, kArm64Tst32, &cont, true,
                                   kLogical32Imm);
+        case IrOpcode::kWord32Equal: {
+          // Word32Equal(Word32Equal(x, y), 0) => Word32Compare(x, y, ne).
+          Int32BinopMatcher mequal(value);
+          node->ReplaceInput(0, mequal.left().node());
+          node->ReplaceInput(1, mequal.right().node());
+          cont.Negate();
+          return VisitWord32Compare(this, node, &cont);
+        }
         default:
           break;
       }