[builtins] Array.prototype.filter implemented as a TurboFan code stub.

src/flag-definitions.h

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 // This file defines all of the flags.  It is separated into different section,
 // for Debug, Release, Logging and Profiling, etc.  To add a new flag, find the
 // correct section, and use one of the DEFINE_ macros, without a trailing ';'.
 //
 // This include does not have a guard, because it is a template-style include,
 // which can be included multiple times in different modes.  It expects to have
@@ skipping 255 matching lines @@
 DEFINE_BOOL(future, FUTURE_BOOL,
             "Implies all staged features that we want to ship in the "
             "not-too-far future")
 DEFINE_IMPLICATION(future, turbo)
 
 DEFINE_DUAL_IMPLICATION(turbo, ignition)
 DEFINE_DUAL_IMPLICATION(turbo, enable_fast_array_builtins)
 DEFINE_DUAL_IMPLICATION(turbo, thin_strings)
 
 // Flags for experimental implementation features.
+DEFINE_BOOL(experimental_array_builtins, false,
+            "Experimental versions of array builtins")

[danno, 2017/03/20 16:58:38]

Consider moving this to the section in this file "// builtins.cc"

[mvstanton, 2017/03/20 22:08:31]

Done.

 DEFINE_BOOL(allocation_site_pretenuring, true,
             "pretenure with allocation sites")
 DEFINE_BOOL(mark_shared_functions_for_tier_up, true,
             "mark shared functions for tier up")
 DEFINE_BOOL(mark_optimizing_shared_functions, true,
             "mark shared functions if they are concurrently optimizing")
 DEFINE_BOOL(page_promotion, true, "promote pages based on utilization")
 DEFINE_INT(page_promotion_threshold, 70,
            "min percentage of live bytes on a page to enable fast evacuation")
 DEFINE_BOOL(smi_binop, true, "support smi representation in binary operations")
@@ skipping 1044 matching lines @@
 #undef DEFINE_ALIAS_FLOAT
 #undef DEFINE_ALIAS_ARGS
 
 #undef FLAG_MODE_DECLARE
 #undef FLAG_MODE_DEFINE
 #undef FLAG_MODE_DEFINE_DEFAULTS
 #undef FLAG_MODE_META
 #undef FLAG_MODE_DEFINE_IMPLICATIONS
 
 #undef COMMA