Create a internal, global native context used only for generated code stubs

src/contexts.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.
 
 #ifndef V8_CONTEXTS_H_
 #define V8_CONTEXTS_H_
 
 #include "src/heap/heap.h"
 #include "src/objects.h"
 
@@ skipping 447 matching lines @@
     SET_FROM_ARRAY_INDEX,
     MAP_ITERATOR_MAP_INDEX,
     SET_ITERATOR_MAP_INDEX,
     ARRAY_VALUES_ITERATOR_INDEX,
     SCRIPT_CONTEXT_TABLE_INDEX,
     MAP_CACHE_INDEX,
     STRONG_MAP_CACHE_INDEX,
     TO_LENGTH_FUN_INDEX,
     NATIVES_UTILS_OBJECT_INDEX,
     EXTRAS_EXPORTS_OBJECT_INDEX,
+    CODE_STUB_EXPORTS_OBJECT_INDEX,
 
     // Properties from here are treated as weak references by the full GC.
     // Scavenge treats them as strong references.
     OPTIMIZED_FUNCTIONS_LIST,  // Weak.
     OPTIMIZED_CODE_LIST,       // Weak.
     DEOPTIMIZED_CODE_LIST,     // Weak.
     NEXT_CONTEXT_LINK,         // Weak.
 
     // Total number of slots.
     NATIVE_CONTEXT_SLOTS,
@@ skipping 190 matching lines @@
   static bool IsBootstrappingOrGlobalObject(Isolate* isolate, Object* object);
 #endif
 
   STATIC_ASSERT(kHeaderSize == Internals::kContextHeaderSize);
   STATIC_ASSERT(EMBEDDER_DATA_INDEX == Internals::kContextEmbedderDataIndex);
 };
 
 } }  // namespace v8::internal
 
 #endif  // V8_CONTEXTS_H_