Revert change to always call builtins for Array functions....

src/contexts.h

Index: src/contexts.h
===================================================================
--- src/contexts.h	(revision 4073)
+++ src/contexts.h	(working copy)
@@ -50,6 +50,12 @@
 // must always be allocated via Heap::AllocateContext() or
 // Factory::NewContext.
 
+// Comment for special_function_table:
+// Table for providing optimized/specialized functions.
+// The array contains triplets [object, general_function, optimized_function].
+// Primarily added to support built-in optimized variants of
+// Array.prototype.{push,pop}.
+
 #define GLOBAL_CONTEXT_FIELDS(V) \
   V(GLOBAL_PROXY_INDEX, JSObject, global_proxy_object) \
   V(SECURITY_TOKEN_INDEX, Object, security_token) \
@@ -76,6 +82,7 @@
   V(FUNCTION_MAP_INDEX, Map, function_map) \
   V(FUNCTION_INSTANCE_MAP_INDEX, Map, function_instance_map) \
   V(JS_ARRAY_MAP_INDEX, Map, js_array_map)\
+  V(SPECIAL_FUNCTION_TABLE_INDEX, FixedArray, special_function_table) \
   V(ARGUMENTS_BOILERPLATE_INDEX, JSObject, arguments_boilerplate) \
   V(MESSAGE_LISTENERS_INDEX, JSObject, message_listeners) \
   V(MAKE_MESSAGE_FUN_INDEX, JSFunction, make_message_fun) \
@@ -199,6 +206,7 @@
     GLOBAL_EVAL_FUN_INDEX,
     INSTANTIATE_FUN_INDEX,
     CONFIGURE_INSTANCE_FUN_INDEX,
+    SPECIAL_FUNCTION_TABLE_INDEX,
     MESSAGE_LISTENERS_INDEX,
     MAKE_MESSAGE_FUN_INDEX,
     GET_STACK_TRACE_LINE_INDEX,