[turbofan] Add support for CreateIterResultObject.

src/compiler/js-generic-lowering.cc

Index: src/compiler/js-generic-lowering.cc
diff --git a/src/compiler/js-generic-lowering.cc b/src/compiler/js-generic-lowering.cc
index 6aabf78f849174a9d5c31a609d487e387b75ecca..db8db500369c6cc007bfae8433de0e6cc311c4fc 100644
--- a/src/compiler/js-generic-lowering.cc
+++ b/src/compiler/js-generic-lowering.cc
@@ -498,6 +498,11 @@ void JSGenericLowering::LowerJSCreateClosure(Node* node) {
 }
 
 
+void JSGenericLowering::LowerJSCreateIterResultObject(Node* node) {
+  ReplaceWithRuntimeCall(node, Runtime::kCreateIterResultObject);
+}
+
+
 void JSGenericLowering::LowerJSCreateLiteralArray(Node* node) {
   CreateLiteralParameters const& p = CreateLiteralParametersOf(node->op());
   node->InsertInput(zone(), 1, jsgraph()->SmiConstant(p.index()));