Object.observe: implement map bit and functions to access it.

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 3133 matching lines @@
 void Map::set_owns_descriptors(bool is_shared) {
   set_bit_field3(OwnsDescriptors::update(bit_field3(), is_shared));
 }
 
 
 bool Map::owns_descriptors() {
   return OwnsDescriptors::decode(bit_field3());
 }
 
 
+void Map::set_is_observed(bool is_observed) {
+  set_bit_field3(IsObserved::update(bit_field3(), is_observed));
+}
+
+
+bool Map::is_observed() {
+  return IsObserved::decode(bit_field3());
+}
+
+
 void Code::set_flags(Code::Flags flags) {
   STATIC_ASSERT(Code::NUMBER_OF_KINDS <= KindField::kMax + 1);
   // Make sure that all call stubs have an arguments count.
   ASSERT((ExtractKindFromFlags(flags) != CALL_IC &&
           ExtractKindFromFlags(flags) != KEYED_CALL_IC) ||
          ExtractArgumentsCountFromFlags(flags) >= 0);
   WRITE_INT_FIELD(this, kFlagsOffset, flags);
 }
 
 
@@ skipping 2377 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_