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

src/contexts.h

 // Copyright 2006-2008 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 32 matching lines @@
 
 // Heap-allocated activation contexts.
 //
 // Contexts are implemented as FixedArray objects; the Context
 // class is a convenience interface casted on a FixedArray object.
 //
 // Note: Context must have no virtual functions and Context objects
 // 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) \
   V(BOOLEAN_FUNCTION_INDEX, JSFunction, boolean_function) \
   V(NUMBER_FUNCTION_INDEX, JSFunction, number_function) \
   V(STRING_FUNCTION_INDEX, JSFunction, string_function) \
   V(OBJECT_FUNCTION_INDEX, JSFunction, object_function) \
   V(ARRAY_FUNCTION_INDEX, JSFunction, array_function) \
   V(DATE_FUNCTION_INDEX, JSFunction, date_function) \
   V(JSON_OBJECT_INDEX, JSObject, json_object) \
   V(REGEXP_FUNCTION_INDEX, JSFunction, regexp_function) \
   V(INITIAL_OBJECT_PROTOTYPE_INDEX, JSObject, initial_object_prototype) \
   V(CREATE_DATE_FUN_INDEX, JSFunction,  create_date_fun) \
   V(TO_NUMBER_FUN_INDEX, JSFunction, to_number_fun) \
   V(TO_STRING_FUN_INDEX, JSFunction, to_string_fun) \
   V(TO_DETAIL_STRING_FUN_INDEX, JSFunction, to_detail_string_fun) \
   V(TO_OBJECT_FUN_INDEX, JSFunction, to_object_fun) \
   V(TO_INTEGER_FUN_INDEX, JSFunction, to_integer_fun) \
   V(TO_UINT32_FUN_INDEX, JSFunction, to_uint32_fun) \
   V(TO_INT32_FUN_INDEX, JSFunction, to_int32_fun) \
   V(GLOBAL_EVAL_FUN_INDEX, JSFunction, global_eval_fun) \
   V(INSTANTIATE_FUN_INDEX, JSFunction, instantiate_fun) \
   V(CONFIGURE_INSTANCE_FUN_INDEX, JSFunction, configure_instance_fun) \
   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) \
   V(GET_STACK_TRACE_LINE_INDEX, JSFunction, get_stack_trace_line_fun) \
   V(CONFIGURE_GLOBAL_INDEX, JSFunction, configure_global_fun) \
   V(FUNCTION_CACHE_INDEX, JSObject, function_cache) \
   V(RUNTIME_CONTEXT_INDEX, Context, runtime_context) \
   V(CALL_AS_FUNCTION_DELEGATE_INDEX, JSFunction, call_as_function_delegate) \
   V(CALL_AS_CONSTRUCTOR_DELEGATE_INDEX, JSFunction, \
     call_as_constructor_delegate) \
@@ skipping 103 matching lines @@
     TO_STRING_FUN_INDEX,
     TO_DETAIL_STRING_FUN_INDEX,
     TO_OBJECT_FUN_INDEX,
     TO_INTEGER_FUN_INDEX,
     TO_UINT32_FUN_INDEX,
     TO_INT32_FUN_INDEX,
     TO_BOOLEAN_FUN_INDEX,
     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,
     CONFIGURE_GLOBAL_INDEX,
     FUNCTION_CACHE_INDEX,
     RUNTIME_CONTEXT_INDEX,
     CALL_AS_FUNCTION_DELEGATE_INDEX,
     CALL_AS_CONSTRUCTOR_DELEGATE_INDEX,
     EMPTY_SCRIPT_INDEX,
     SCRIPT_FUNCTION_INDEX,
@@ skipping 117 matching lines @@
 #ifdef DEBUG
   // Bootstrapping-aware type checks.
   static bool IsBootstrappingOrContext(Object* object);
   static bool IsBootstrappingOrGlobalObject(Object* object);
 #endif
 };
 
 } }  // namespace v8::internal
 
 #endif  // V8_CONTEXTS_H_