Native context: do not put public symbols and flags on the js builtins object.

src/harmony-simd.js

 // Copyright 2015 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.
 
 (function(global, utils) {
 
 "use strict";
 
 %CheckIsBootstrapping();
 
 // -------------------------------------------------------------------
 // Imports
 
 var GlobalSIMD = global.SIMD;
+var toStringTagSymbol = utils.ImportNow("to_string_tag_symbol");
 
 macro SIMD_FLOAT_TYPES(FUNCTION)
 FUNCTION(Float32x4, float32x4, 4)
 endmacro
 
 macro SIMD_INT_TYPES(FUNCTION)
 FUNCTION(Int32x4, int32x4, 4)
 FUNCTION(Int16x8, int16x8, 8)
 FUNCTION(Int8x16, int8x16, 16)
 endmacro
@@ skipping 545 matching lines @@
 function Float32x4MinNumJS(a, b) {
   return %Float32x4MinNum(a, b);
 }
 
 
 function Float32x4MaxNumJS(a, b) {
   return %Float32x4MaxNum(a, b);
 }
 
 
-%AddNamedProperty(GlobalSIMD, symbolToStringTag, 'SIMD', READ_ONLY | DONT_ENUM);
+%AddNamedProperty(GlobalSIMD, toStringTagSymbol, 'SIMD', READ_ONLY | DONT_ENUM);
 
 macro SETUP_SIMD_TYPE(NAME, TYPE, LANES)
 %SetCode(GlobalNAME, NAMEConstructor);
 %FunctionSetPrototype(GlobalNAME, {});
 %AddNamedProperty(GlobalNAME.prototype, 'constructor', GlobalNAME,
     DONT_ENUM);
-%AddNamedProperty(GlobalNAME.prototype, symbolToStringTag, 'NAME',
+%AddNamedProperty(GlobalNAME.prototype, toStringTagSymbol, 'NAME',
     DONT_ENUM | READ_ONLY);
 utils.InstallFunctions(GlobalNAME.prototype, DONT_ENUM, [
   'toLocaleString', NAMEToLocaleString,
   'toString', NAMEToString,
   'valueOf', NAMEValueOf,
 ]);
 endmacro
 
 SIMD_ALL_TYPES(SETUP_SIMD_TYPE)
 
@@ skipping 344 matching lines @@
   to.Bool32x4ToString = Bool32x4ToString;
   to.Int16x8ToString = Int16x8ToString;
   to.Uint16x8ToString = Uint16x8ToString;
   to.Bool16x8ToString = Bool16x8ToString;
   to.Int8x16ToString = Int8x16ToString;
   to.Uint8x16ToString = Uint8x16ToString;
   to.Bool8x16ToString = Bool8x16ToString;
 });
 
 })