Replace mapcheck dependency on HStoreNamedField with object.

src/hydrogen.cc

Index: src/hydrogen.cc
diff --git a/src/hydrogen.cc b/src/hydrogen.cc
index b6199831f007633fecaf7c87f28432a18fe6b380..fd4cc351af8b07d7fad9c547bfce99f04586b708 100644
--- a/src/hydrogen.cc
+++ b/src/hydrogen.cc
@@ -4495,7 +4495,7 @@ HInstruction* HOptimizedGraphBuilder::BuildStoreNamedField(
       AddStoreMapConstant(heap_number, isolate()->factory()->heap_number_map());
       Add<HStoreNamedField>(heap_number, HObjectAccess::ForHeapNumberValue(),
                             value);
-      instr = New<HStoreNamedField>(checked_object,
+      instr = New<HStoreNamedField>(checked_object->ActualValue(),
                                     heap_number_access,
                                     heap_number);
     } else {
@@ -4509,7 +4509,9 @@ HInstruction* HOptimizedGraphBuilder::BuildStoreNamedField(
     }
   } else {
     // This is a normal store.
-    instr = New<HStoreNamedField>(checked_object, field_access, value);
+    instr = New<HStoreNamedField>(checked_object->ActualValue(),
+                                  field_access,
+                                  value);
   }
 
   if (transition_to_field) {