Make int an abstract class.

runtime/vm/flow_graph_compiler_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"  // Needed here to get TARGET_ARCH_X64.
 #if defined(TARGET_ARCH_X64)
 
 #include "vm/flow_graph_compiler.h"
 
 #include "lib/error.h"
@@ skipping 326 matching lines @@
     __ cmpq(RDI, raw_null);
     __ j(EQUAL,  is_instance_lbl);
     const Type& object_type = Type::ZoneHandle(Type::ObjectType());
     __ CompareObject(RDI, object_type);
     __ j(EQUAL,  is_instance_lbl);
 
     // For Smi check quickly against int and num interfaces.
     Label not_smi;
     __ testq(RAX, Immediate(kSmiTagMask));  // Value is Smi?
     __ j(NOT_ZERO, &not_smi, Assembler::kNearJump);
-    __ CompareObject(RDI, Type::ZoneHandle(Type::IntInterface()));
+    __ CompareObject(RDI, Type::ZoneHandle(Type::IntType()));
     __ j(EQUAL,  is_instance_lbl);
     __ CompareObject(RDI, Type::ZoneHandle(Type::Number()));
     __ j(EQUAL,  is_instance_lbl);
     // Smi must be handled in runtime.
     __ jmp(&fall_through);
 
     __ Bind(&not_smi);
     // RDX: instantiator type arguments.
     // RAX: instance.
     const Register kInstanceReg = RAX;
@@ skipping 1008 matching lines @@
 void ParallelMoveResolver::Exchange(const Address& mem1, const Address& mem2) {
   __ Exchange(mem1, mem2);
 }
 
 
 #undef __
 
 }  // namespace dart
 
 #endif  // defined TARGET_ARCH_X64