Support all fast elements kinds in the major array operations.

src/elements.h

Index: src/elements.h
diff --git a/src/elements.h b/src/elements.h
index 8a83f0fee8581f48455205dae1bfa2b6d91842a5..f5866ae975fa01c777c03b366229bb9befcde878 100644
--- a/src/elements.h
+++ b/src/elements.h
@@ -175,16 +175,6 @@ class ElementsAccessor {
   DISALLOW_COPY_AND_ASSIGN(ElementsAccessor);
 };
 
-
-void CopyObjectToObjectElements(FixedArray* from_obj,
-                                ElementsKind from_kind,
-                                uint32_t from_start,
-                                FixedArray* to_obj,
-                                ElementsKind to_kind,
-                                uint32_t to_start,
-                                int copy_size);
-
-
 } }  // namespace v8::internal
 
 #endif  // V8_ELEMENTS_H_