Use class id instead of class in subtype test cache.

runtime/vm/object_test.cc

 // Copyright (c) 2012, 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 "platform/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 2628 matching lines @@
 TEST_CASE(SubtypeTestCache) {
   String& class_name = String::Handle(String::NewSymbol("EmptyClass"));
   Script& script = Script::Handle();
   const Class& empty_class =
       Class::Handle(Class::New(class_name, script, Scanner::kDummyTokenIndex));
   SubtypeTestCache& cache = SubtypeTestCache::Handle(SubtypeTestCache::New());
   ASSERT(!cache.IsNull());
   EXPECT_EQ(0, cache.NumberOfChecks());
   const TypeArguments& targ_0 = TypeArguments::Handle(TypeArguments::New(2));
   const TypeArguments& targ_1 = TypeArguments::Handle(TypeArguments::New(3));
-  cache.AddCheck(empty_class, targ_0, targ_1, Bool::Handle(Bool::True()));
+  cache.AddCheck(empty_class.id(), targ_0, targ_1, Bool::Handle(Bool::True()));
   EXPECT_EQ(1, cache.NumberOfChecks());
-  Class& test_class = Class::Handle();
+  intptr_t test_class_id = -1;
   AbstractTypeArguments& test_targ_0 = AbstractTypeArguments::Handle();
   AbstractTypeArguments& test_targ_1 = AbstractTypeArguments::Handle();
   Bool& test_result = Bool::Handle();
-  cache.GetCheck(0, &test_class, &test_targ_0, &test_targ_1, &test_result);
-  EXPECT_EQ(empty_class.raw(), test_class.raw());
+  cache.GetCheck(0, &test_class_id, &test_targ_0, &test_targ_1, &test_result);
+  EXPECT_EQ(empty_class.id(), test_class_id);
   EXPECT_EQ(targ_0.raw(), test_targ_0.raw());
   EXPECT_EQ(targ_1.raw(), test_targ_1.raw());
   EXPECT_EQ(Bool::True(), test_result.raw());
 }
 
 
 TEST_CASE(FieldTests) {
   const String& f = String::Handle(String::New("oneField"));
   const String& getter_f = String::Handle(Field::GetterName(f));
   const String& setter_f = String::Handle(Field::SetterName(f));
@@ skipping 110 matching lines @@
   // Named double-private constructor mismatch.
   mangled_name = String::New("foo@12345.named@12345");
   bare_name = String::New("foo.name");
   EXPECT(!EqualsIgnoringPrivate(mangled_name, bare_name));
 }
 
 
 #endif  // defined(TARGET_ARCH_IA32) || defined(TARGET_ARCH_X64).
 
 }  // namespace dart