Initial isolate reload support

runtime/vm/flow_graph_compiler_x64.cc

 // Copyright (c) 2013, 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/globals.h"  // Needed here to get TARGET_ARCH_X64.
 #if defined(TARGET_ARCH_X64)
 
 #include "vm/flow_graph_compiler.h"
 
 #include "vm/ast_printer.h"
@@ skipping 424 matching lines @@
     TokenPosition token_pos,
     const Class& type_class,
     Label* is_instance_lbl,
     Label* is_not_instance_lbl) {
   __ Comment("Subtype1TestCacheLookup");
   const Register kInstanceReg = RAX;
   __ LoadClass(R10, kInstanceReg);
   // R10: instance class.
   // Check immediate superclass equality.
   __ movq(R13, FieldAddress(R10, Class::super_type_offset()));
-  __ movq(R13, FieldAddress(R13, Type::type_class_offset()));
-  __ CompareObject(R13, type_class);
+  __ movq(R13, FieldAddress(R13, Type::type_class_id_offset()));
+  __ CompareImmediate(R13, Immediate(Smi::RawValue(type_class.id())));
   __ j(EQUAL, is_instance_lbl);
 
   const Register kTypeArgumentsReg = kNoRegister;
   const Register kTempReg = R10;
   return GenerateCallSubtypeTestStub(kTestTypeOneArg,
                                      kInstanceReg,
                                      kTypeArgumentsReg,
                                      kTempReg,
                                      is_instance_lbl,
                                      is_not_instance_lbl);
@@ skipping 1411 matching lines @@
   __ movups(reg, Address(RSP, 0));
   __ AddImmediate(RSP, Immediate(kFpuRegisterSize));
 }
 
 
 #undef __
 
 }  // namespace dart
 
 #endif  // defined TARGET_ARCH_X64