[wasm] Int64Lowering of Int64Add on ia32 and arm.

src/compiler/machine-operator.h

Index: src/compiler/machine-operator.h
diff --git a/src/compiler/machine-operator.h b/src/compiler/machine-operator.h
index fda941743dee9793177537497c00859911b7e442..7f9f8ea6cbfbf92f4d1fe35875d4844acd28f89d 100644
--- a/src/compiler/machine-operator.h
+++ b/src/compiler/machine-operator.h
@@ -179,6 +179,7 @@ class MachineOperatorBuilder final : public ZoneObject {
   const OptionalOperator Word64Ctz();
   const Operator* Word64Equal();
 
+  const Operator* Int32AddPair();
   const Operator* Word32PairShl();
 
   const Operator* Int32Add();