Use class id instead of class in subtype test cache.

runtime/vm/object.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 "vm/object.h"
 
 #include "platform/assert.h"
 #include "vm/assembler.h"
 #include "vm/bigint_operations.h"
 #include "vm/bootstrap.h"
@@ skipping 7202 matching lines @@
 }
 
 
 intptr_t SubtypeTestCache::NumberOfChecks() const {
   // Do not count the sentinel;
   return (Array::Handle(cache()).Length() / kTestEntryLength) - 1;
 }
 
 
 void SubtypeTestCache::AddCheck(
-    const Class& instance_class,
+    intptr_t instance_class_id,
     const AbstractTypeArguments& instance_type_arguments,
     const AbstractTypeArguments& instantiator_type_arguments,
     const Bool& test_result) const {
   intptr_t old_num = NumberOfChecks();
   Array& data = Array::Handle(cache());
   intptr_t new_len = data.Length() + kTestEntryLength;
   data = Array::Grow(data, new_len);
   set_cache(data);
   intptr_t data_pos = old_num * kTestEntryLength;
-  data.SetAt(data_pos + kInstanceClass, instance_class);
+  data.SetAt(data_pos + kInstanceClassId,
+      Smi::Handle(Smi::New(instance_class_id)));
   data.SetAt(data_pos + kInstanceTypeArguments, instance_type_arguments);
   data.SetAt(data_pos + kInstantiatorTypeArguments,
       instantiator_type_arguments);
   data.SetAt(data_pos + kTestResult, test_result);
 }
 
 
 void SubtypeTestCache::GetCheck(
     intptr_t ix,
-    Class* instance_class,
+    intptr_t* instance_class_id,
     AbstractTypeArguments* instance_type_arguments,
     AbstractTypeArguments* instantiator_type_arguments,
     Bool* test_result) const {
   Array& data = Array::Handle(cache());
   intptr_t data_pos = ix * kTestEntryLength;
-  *instance_class ^= data.At(data_pos + kInstanceClass);
+  Smi& instance_class_id_handle = Smi::Handle();
+  instance_class_id_handle ^= data.At(data_pos + kInstanceClassId);
+  *instance_class_id = instance_class_id_handle.Value();
   *instance_type_arguments ^= data.At(data_pos + kInstanceTypeArguments);
   *instantiator_type_arguments ^=
       data.At(data_pos + kInstantiatorTypeArguments);
   *test_result ^= data.At(data_pos + kTestResult);
 }
 
 
 const char* SubtypeTestCache::ToCString() const {
   return "SubtypeTestCache";
 }
@@ skipping 3392 matching lines @@
   const String& str = String::Handle(pattern());
   const char* format = "JSRegExp: pattern=%s flags=%s";
   intptr_t len = OS::SNPrint(NULL, 0, format, str.ToCString(), Flags());
   char* chars = reinterpret_cast<char*>(
       Isolate::Current()->current_zone()->Allocate(len + 1));
   OS::SNPrint(chars, (len + 1), format, str.ToCString(), Flags());
   return chars;
 }
 
 }  // namespace dart