[es6] Move builtin constructors for primitives to strict mode.

src/v8natives.js

 // 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.
 
 (function(global, utils) {
 
 %CheckIsBootstrapping();
 
 // ----------------------------------------------------------------------------
 // Imports
@@ skipping 1323 matching lines @@
   "seal", ObjectSealJS
   // deliverChangeRecords, getNotifier, observe and unobserve are added
   // in object-observe.js.
 ]);
 
 
 // ----------------------------------------------------------------------------
 // Boolean
 
 function BooleanConstructor(x) {
+  // TODO(bmeurer): Move this to toplevel.
+  "use strict";
   if (%_IsConstructCall()) {
     %_SetValueOf(this, ToBoolean(x));
   } else {
     return ToBoolean(x);
   }
 }
 
 
 function BooleanToString() {
   // NOTE: Both Boolean objects and values can enter here as
@@ skipping 29 matching lines @@
 utils.InstallFunctions(GlobalBoolean.prototype, DONT_ENUM, [
   "toString", BooleanToString,
   "valueOf", BooleanValueOf
 ]);
 
 
 // ----------------------------------------------------------------------------
 // Number
 
 function NumberConstructor(x) {
+  // TODO(bmeurer): Move this to toplevel.
+  "use strict";
   var value = %_ArgumentsLength() == 0 ? 0 : ToNumber(x);
   if (%_IsConstructCall()) {
     %_SetValueOf(this, value);
   } else {
     return value;
   }
 }
 
 
 // ECMA-262 section 15.7.4.2.
@@ skipping 406 matching lines @@
 });
 
 %InstallToContext([
   "global_eval_fun", GlobalEval,
   "object_define_own_property", DefineOwnPropertyFromAPI,
   "object_get_own_property_descriptor", ObjectGetOwnPropertyDescriptor,
   "to_complete_property_descriptor", ToCompletePropertyDescriptor,
 ]);
 
 })