[wasm] Int64Lowering of Int64Add on ia32 and arm.

src/compiler/instruction-selector.cc

Index: src/compiler/instruction-selector.cc
diff --git a/src/compiler/instruction-selector.cc b/src/compiler/instruction-selector.cc
index 5fc0f3c134566d61f4f5ebcfea1fd981804e2577..4aac8728f5c9f185836347f6ac94133b6454996c 100644
--- a/src/compiler/instruction-selector.cc
+++ b/src/compiler/instruction-selector.cc
@@ -1150,6 +1150,10 @@ void InstructionSelector::VisitNode(Node* node) {
     }
     case IrOpcode::kCheckedStore:
       return VisitCheckedStore(node);
+    case IrOpcode::kInt32AddPair:
+      MarkAsWord32(NodeProperties::FindProjection(node, 0));
+      MarkAsWord32(NodeProperties::FindProjection(node, 1));
+      return VisitInt32AddPair(node);
     case IrOpcode::kWord32PairShl:
       MarkAsWord32(NodeProperties::FindProjection(node, 0));
       MarkAsWord32(NodeProperties::FindProjection(node, 1));
@@ -1379,6 +1383,8 @@ void InstructionSelector::VisitBitcastInt64ToFloat64(Node* node) {
 
 // 32 bit targets do not implement the following instructions.
 #if V8_TARGET_ARCH_64_BIT
+void InstructionSelector::VisitInt32AddPair(Node* node) { UNIMPLEMENTED(); }
+
 void InstructionSelector::VisitWord32PairShl(Node* node) { UNIMPLEMENTED(); }
 #endif  // V8_TARGET_ARCH_64_BIT
 
@@ -1459,6 +1465,7 @@ void InstructionSelector::VisitProjection(Node* node) {
     case IrOpcode::kTryTruncateFloat64ToInt64:
     case IrOpcode::kTryTruncateFloat32ToUint64:
     case IrOpcode::kTryTruncateFloat64ToUint64:
+    case IrOpcode::kInt32AddPair:
     case IrOpcode::kWord32PairShl:
       if (ProjectionIndexOf(node->op()) == 0u) {
         Emit(kArchNop, g.DefineSameAsFirst(node), g.Use(value));