Introduce global contexts to represent lexical global scope(s).

src/objects-inl.h

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 550 matching lines @@
   if (!IsFixedArray()) return false;
   // There's actually no way to see the difference between a fixed array and
   // a cache cells array.  Since this is used for asserts we can check that
   // the length is plausible though.
   if (FixedArray::cast(this)->length() % 2 != 0) return false;
   return true;
 }
 
 
 bool Object::IsContext() {
-  if (Object::IsHeapObject()) {
-    Map* map = HeapObject::cast(this)->map();
-    Heap* heap = map->GetHeap();
-    return (map == heap->function_context_map() ||
-            map == heap->catch_context_map() ||
-            map == heap->with_context_map() ||
-            map == heap->native_context_map() ||
-            map == heap->block_context_map() ||
-            map == heap->module_context_map());
-  }
-  return false;
+  if (!Object::IsHeapObject()) return false;
+  Map* map = HeapObject::cast(this)->map();
+  Heap* heap = map->GetHeap();
+  return (map == heap->function_context_map() ||
+      map == heap->catch_context_map() ||
+      map == heap->with_context_map() ||
+      map == heap->native_context_map() ||
+      map == heap->block_context_map() ||
+      map == heap->module_context_map() ||
+      map == heap->global_context_map());
 }
 
 
 bool Object::IsNativeContext() {
   return Object::IsHeapObject() &&
       HeapObject::cast(this)->map() ==
       HeapObject::cast(this)->GetHeap()->native_context_map();
 }
 
 
-bool Object::IsModuleContext() {
-  return Object::IsHeapObject() &&
-      HeapObject::cast(this)->map() ==
-      HeapObject::cast(this)->GetHeap()->module_context_map();
-}
-
-
 bool Object::IsScopeInfo() {
   return Object::IsHeapObject() &&
       HeapObject::cast(this)->map() ==
       HeapObject::cast(this)->GetHeap()->scope_info_map();
 }
 
 
 TYPE_CHECKER(JSFunction, JS_FUNCTION_TYPE)
 
 
@@ skipping 4771 matching lines @@
 #undef WRITE_UINT32_FIELD
 #undef READ_SHORT_FIELD
 #undef WRITE_SHORT_FIELD
 #undef READ_BYTE_FIELD
 #undef WRITE_BYTE_FIELD
 
 
 } }  // namespace v8::internal
 
 #endif  // V8_OBJECTS_INL_H_