[wasm] Int64Lowering of Int64Add on ia32 and arm.

src/compiler/raw-machine-assembler.h

Index: src/compiler/raw-machine-assembler.h
diff --git a/src/compiler/raw-machine-assembler.h b/src/compiler/raw-machine-assembler.h
index affb02e91a4de4255fff922a6192e1556f640f90..ee4d109f3c8b321f9c809d7b2d061c58f7520bf1 100644
--- a/src/compiler/raw-machine-assembler.h
+++ b/src/compiler/raw-machine-assembler.h
@@ -324,6 +324,9 @@ class RawMachineAssembler {
   Node* Uint64Mod(Node* a, Node* b) {
     return AddNode(machine()->Uint64Mod(), a, b);
   }
+  Node* Int32PairAdd(Node* a_low, Node* a_high, Node* b_low, Node* b_high) {
+    return AddNode(machine()->Int32PairAdd(), a_low, a_high, b_low, b_high);
+  }
   Node* Word32PairShl(Node* low_word, Node* high_word, Node* shift) {
     return AddNode(machine()->Word32PairShl(), low_word, high_word, shift);
   }