Fix missing write barrier in store field stub.

src/x64/lithium-x64.h

Index: src/x64/lithium-x64.h
diff --git a/src/x64/lithium-x64.h b/src/x64/lithium-x64.h
index 642a0a00385a94e730c7bba517f0466caa6bfc47..b8f8b096d73b68eb50a2cd1f93c88cb38b1009fa 100644
--- a/src/x64/lithium-x64.h
+++ b/src/x64/lithium-x64.h
@@ -1635,12 +1635,16 @@ class LSmiUntag: public LTemplateInstruction<1, 1, 0> {
 };
 
 
-class LStoreNamedField: public LTemplateInstruction<0, 2, 1> {
+class LStoreNamedField: public LTemplateInstruction<0, 2, 2> {
  public:
-  LStoreNamedField(LOperand* object, LOperand* value, LOperand* temp) {
+  LStoreNamedField(LOperand* object,
+                   LOperand* value,
+                   LOperand* temp,
+                   LOperand* temp_map) {
     inputs_[0] = object;
     inputs_[1] = value;
     temps_[0] = temp;
+    temps_[1] = temp_map;
   }
 
   DECLARE_CONCRETE_INSTRUCTION(StoreNamedField, "store-named-field")