Correctly load RegExp.source from the holder.

src/accessors.cc

 // 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.
 
 #include "src/v8.h"
 
 #include "src/accessors.h"
 #include "src/api.h"
 #include "src/compiler.h"
 #include "src/contexts.h"
@@ skipping 364 matching lines @@
   }
 }
 
 
 // Implements ECMA262 ES6 draft 21.2.5.9
 void Accessors::RegExpSourceGetter(
     v8::Local<v8::Name> name, const v8::PropertyCallbackInfo<v8::Value>& info) {
   i::Isolate* isolate = reinterpret_cast<i::Isolate*>(info.GetIsolate());
   HandleScope scope(isolate);
 
-  Handle<Object> receiver =
-      Utils::OpenHandle(*v8::Local<v8::Value>(info.This()));
-  Handle<JSRegExp> regexp = Handle<JSRegExp>::cast(receiver);
+  Handle<Object> holder =
+      Utils::OpenHandle(*v8::Local<v8::Value>(info.Holder()));
+  Handle<JSRegExp> regexp = Handle<JSRegExp>::cast(holder);
   Handle<String> result;
   if (regexp->TypeTag() == JSRegExp::NOT_COMPILED) {
     result = isolate->factory()->empty_string();
   } else {
     Handle<String> pattern(regexp->Pattern(), isolate);
     MaybeHandle<String> maybe = EscapeRegExpSource(isolate, pattern);
     if (!maybe.ToHandle(&result)) {
       isolate->OptionalRescheduleException(false);
       return;
     }
@@ skipping 1096 matching lines @@
   info->set_data(Smi::FromInt(index));
   Handle<Object> getter = v8::FromCData(isolate, &ModuleGetExport);
   Handle<Object> setter = v8::FromCData(isolate, &ModuleSetExport);
   info->set_getter(*getter);
   if (!(attributes & ReadOnly)) info->set_setter(*setter);
   return info;
 }
 
 
 } }  // namespace v8::internal