Factor out super-class and interface array subtype checks into a stub.

runtime/vm/stub_code_x64.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/globals.h"
 #if defined(TARGET_ARCH_X64)
 
 #include "vm/code_generator.h"
 #include "vm/compiler.h"
 #include "vm/object_store.h"
@@ skipping 1711 matching lines @@
   // Find out which dispatch stub to call.
   Label ic_cache_one_arg;
   __ movq(RCX, FieldAddress(RBX, ICData::num_args_tested_offset()));
   __ cmpq(RCX, Immediate(1));
   __ j(EQUAL, &ic_cache_one_arg, Assembler::kNearJump);
   __ jmp(&StubCode::TwoArgsCheckInlineCacheLabel());
   __ Bind(&ic_cache_one_arg);
   __ jmp(&StubCode::OneArgCheckInlineCacheLabel());
 }
 
+
+void StubCode::GenerateIsRawSubTypeStub(Assembler* assembler) {
+  __ Unimplemented("IsRawSubType Stub");
+}
+
 }  // namespace dart
 
 #endif  // defined TARGET_ARCH_X64