Merge revision 3813 to 3930 from bleeding_edge to partial snapshots branch.

src/objects-inl.h

Index: src/objects-inl.h
===================================================================
--- src/objects-inl.h	(revision 3935)
+++ src/objects-inl.h	(working copy)
@@ -2768,6 +2768,13 @@
 }
 
 
+bool JSObject::AllowsSetElementsLength() {
+  bool result = elements()->IsFixedArray();
+  ASSERT(result == (!HasPixelElements() && !HasExternalArrayElements()));
+  return result;
+}
+
+
 StringDictionary* JSObject::property_dictionary() {
   ASSERT(!HasFastProperties());
   return StringDictionary::cast(properties());