Use a stub in crankshaft for grow store arrays.

src/objects.h

Index: src/objects.h
diff --git a/src/objects.h b/src/objects.h
index 067f35782292ae6049066ac0be25ca502329fb5d..b63b1c3b45f741293b292dae432464bda8454d78 100644
--- a/src/objects.h
+++ b/src/objects.h
@@ -1906,7 +1906,8 @@ class JSObject: public JSReceiver {
 
   // Would we convert a fast elements array to dictionary mode given
   // an access at key?
-  bool WouldConvertToSlowElements(Handle<Object> key);
+  bool WouldConvertToSlowElements(uint32_t index);
+  inline bool WouldConvertToSlowElements(Handle<Object> key);
   // Do we want to keep the elements in fast case when increasing the
   // capacity?
   bool ShouldConvertToSlowElements(int new_capacity);
@@ -1966,6 +1967,12 @@ class JSObject: public JSReceiver {
     kDontAllowSmiElements
   };
 
+  static Handle<FixedArray> SetFastElementsCapacity(
+      Handle<JSObject> object, int capacity,
+      SetFastElementsCapacitySmiMode smi_mode);
+  static Handle<FixedArrayBase> SetFastDoubleElementsCapacity(
+      Handle<JSObject> object, int capacity);
+
   // Replace the elements' backing store with fast elements of the given
   // capacity.  Update the length for JSArrays.  Returns the new backing
   // store.
@@ -1974,10 +1981,8 @@ class JSObject: public JSReceiver {
       int capacity,
       int length,
       SetFastElementsCapacitySmiMode smi_mode);
-  static void SetFastDoubleElementsCapacityAndLength(
-      Handle<JSObject> object,
-      int capacity,
-      int length);
+  static Handle<FixedArrayBase> SetFastDoubleElementsCapacityAndLength(
+      Handle<JSObject> object, int capacity, int length);
 
   // Lookup interceptors are used for handling properties controlled by host
   // objects.