Add a flags field to RawObject so that we can tag objects with certain

vm/object_test.cc

 // Copyright (c) 2011, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 #include "vm/assert.h"
 #include "vm/assembler.h"
 #include "vm/bigint_operations.h"
 #include "vm/isolate.h"
 #include "vm/object.h"
 #include "vm/object_store.h"
@@ skipping 154 matching lines @@
   class_name = String::NewSymbol("OneFieldClass");
   const Class& one_field_class = Class::Handle(Class::New(class_name, script));
 
   // No functions and no super class for the OneFieldClass.
   const Array& one_fields = Array::Handle(Array::New(1));
   const String& field_name = String::Handle(String::NewSymbol("the_field"));
   const Field& field = Field::Handle(Field::New(field_name, false, false, 0));
   one_fields.SetAt(0, field);
   one_field_class.SetFields(one_fields);
   one_field_class.Finalize();
-  EXPECT_EQ(2*kWordSize, one_field_class.instance_size());
-  EXPECT_EQ(kWordSize, field.Offset());
+  intptr_t header_size = sizeof(RawObject);
+  EXPECT_EQ(Utils::RoundUp((header_size + (1 * kWordSize)), kObjectAlignment),
+            one_field_class.instance_size());
+  EXPECT_EQ(header_size, field.Offset());
 }
 
 
 TEST_CASE(Interface) {
   String& class_name = String::Handle(String::NewSymbol("EmptyClass"));
   Script& script = Script::Handle();
   const Class& factory_class = Class::Handle(Class::New(class_name, script));
   const Array& no_fields = Array::Handle(Array::Empty());
   // Finalizes the class.
   factory_class.SetFields(no_fields);
@@ skipping 2068 matching lines @@
     cls = iterator.GetNextClass();
     ASSERT((cls.raw() == ae66.raw()) || (cls.raw() == re44.raw()));
     count++;
   }
   ASSERT(count == 2);
 }
 
 #endif  // defined(TARGET_ARCH_IA32) || defined(TARGET_ARCH_X64).
 
 }  // namespace dart