CHECK that FunctionTemplates are not modified after first instantiation

src/factory.cc

 // Copyright 2014 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.
 
 #include "src/factory.h"
 
 #include "src/allocation-site-scopes.h"
 #include "src/base/bits.h"
 #include "src/conversions.h"
 #include "src/isolate-inl.h"
@@ skipping 2225 matching lines @@
 }
 
 
 Handle<JSFunction> Factory::CreateApiFunction(
     Handle<FunctionTemplateInfo> obj,
     Handle<Object> prototype,
     ApiInstanceType instance_type) {
   Handle<Code> code = isolate()->builtins()->HandleApiCall();
   Handle<Code> construct_stub = isolate()->builtins()->JSConstructStubApi();
 
+  obj->set_instantiated(true);
   Handle<JSFunction> result;
   if (obj->remove_prototype()) {
     result = NewFunctionWithoutPrototype(empty_string(), code);
   } else {
     int internal_field_count = 0;
     if (!obj->instance_template()->IsUndefined()) {
       Handle<ObjectTemplateInfo> instance_template =
           Handle<ObjectTemplateInfo>(
               ObjectTemplateInfo::cast(obj->instance_template()));
       internal_field_count =
@@ skipping 257 matching lines @@
   return Handle<Object>::null();
 }
 
 
 Handle<Object> Factory::ToBoolean(bool value) {
   return value ? true_value() : false_value();
 }
 
 
 } }  // namespace v8::internal