[wasm] Int64Lowering of Int64Mul 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 91900be25c30dabec502028de1401680631509ae..1abe81ff2bbd85b198fbe519c5128787bc386fbb 100644
--- a/src/compiler/instruction-selector.cc
+++ b/src/compiler/instruction-selector.cc
@@ -1158,6 +1158,10 @@ void InstructionSelector::VisitNode(Node* node) {
       MarkAsWord32(NodeProperties::FindProjection(node, 0));
       MarkAsWord32(NodeProperties::FindProjection(node, 1));
       return VisitInt32PairSub(node);
+    case IrOpcode::kInt32PairMul:
+      MarkAsWord32(NodeProperties::FindProjection(node, 0));
+      MarkAsWord32(NodeProperties::FindProjection(node, 1));
+      return VisitInt32PairMul(node);
     case IrOpcode::kWord32PairShl:
       MarkAsWord32(NodeProperties::FindProjection(node, 0));
       MarkAsWord32(NodeProperties::FindProjection(node, 1));
@@ -1399,6 +1403,8 @@ void InstructionSelector::VisitInt32PairAdd(Node* node) { UNIMPLEMENTED(); }
 
 void InstructionSelector::VisitInt32PairSub(Node* node) { UNIMPLEMENTED(); }
 
+void InstructionSelector::VisitInt32PairMul(Node* node) { UNIMPLEMENTED(); }
+
 void InstructionSelector::VisitWord32PairShl(Node* node) { UNIMPLEMENTED(); }
 
 void InstructionSelector::VisitWord32PairShr(Node* node) { UNIMPLEMENTED(); }
@@ -1485,6 +1491,7 @@ void InstructionSelector::VisitProjection(Node* node) {
     case IrOpcode::kTryTruncateFloat64ToUint64:
     case IrOpcode::kInt32PairAdd:
     case IrOpcode::kInt32PairSub:
+    case IrOpcode::kInt32PairMul:
     case IrOpcode::kWord32PairShl:
     case IrOpcode::kWord32PairShr:
     case IrOpcode::kWord32PairSar: