Make subtype test stubs isolate-specific.

runtime/vm/assembler_arm.h

 // 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.
 
 #ifndef VM_ASSEMBLER_ARM_H_
 #define VM_ASSEMBLER_ARM_H_
 
 #ifndef VM_ASSEMBLER_H_
 #error Do not include assembler_arm.h directly; use assembler.h instead.
 #endif
@@ skipping 640 matching lines @@
                                       int32_t offset,
                                       Register value);
   void StoreIntoObjectNoBarrier(Register object,
                                 const Address& dest,
                                 const Object& value);
   void StoreIntoObjectNoBarrierOffset(Register object,
                                       int32_t offset,
                                       const Object& value);
 
   void LoadClassId(Register result, Register object, Condition cond = AL);
-  void LoadClassById(Register result, Register class_id);
-  void LoadClass(Register result, Register object, Register scratch);
+  void LoadClassById(Register result, Register class_id, Isolate* isolate);
+  void LoadClass(Register result,
+                 Register object,
+                 Register scratch,
+                 Isolate* isolate);
   void CompareClassId(Register object, intptr_t class_id, Register scratch);
   void LoadTaggedClassIdMayBeSmi(Register result, Register object);
 
   void LoadWordFromPoolOffset(Register rd, int32_t offset, Condition cond = AL);
   void LoadFromOffset(OperandSize type,
                       Register reg,
                       Register base,
                       int32_t offset,
                       Condition cond = AL);
   void StoreToOffset(OperandSize type,
@@ skipping 323 matching lines @@
                                   Register value,
                                   Label* no_update);
 
   DISALLOW_ALLOCATION();
   DISALLOW_COPY_AND_ASSIGN(Assembler);
 };
 
 }  // namespace dart
 
 #endif  // VM_ASSEMBLER_ARM_H_