Start porting fast typechecks to x64.

runtime/vm/flow_graph_compiler_x64.h

 // 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.
 
 #ifndef VM_FLOW_GRAPH_COMPILER_X64_H_
 #define VM_FLOW_GRAPH_COMPILER_X64_H_
 
 #ifndef VM_FLOW_GRAPH_COMPILER_H_
 #error Include flow_graph_compiler.h instead of flow_graph_compiler_x64.h.
 #endif
@@ skipping 91 matching lines @@
                     PcDescriptors::Kind kind);
   void GenerateCallRuntime(intptr_t cid,
                            intptr_t token_index,
                            intptr_t try_index,
                            const RuntimeEntry& entry);
   void AddCurrentDescriptor(PcDescriptors::Kind kind,
                             intptr_t cid,
                             intptr_t token_index,
                             intptr_t try_index);
 
-  void GenerateInlineInstanceof(const AbstractType& type,
-                                Label* is_instance,
-                                Label* is_not_instance);
+  RawSubtypeTestCache* GenerateInlineInstanceof(intptr_t cid,
+                                                intptr_t token_index,
+                                                const AbstractType& type,
+                                                Label* is_instance,
+                                                Label* is_not_instance);
 
   void GenerateAssertAssignable(intptr_t cid,
                                 intptr_t token_index,
                                 intptr_t try_index,
                                 const AbstractType& dst_type,
                                 const String& dst_name);
 
   void GenerateInstanceOf(intptr_t cid,
                           intptr_t token_index,
                           intptr_t try_index,
@@ skipping 20 matching lines @@
   DescriptorList* pc_descriptors_list_;
   ExceptionHandlerList* exception_handlers_list_;
   const bool is_optimizing_;
 
   DISALLOW_COPY_AND_ASSIGN(FlowGraphCompiler);
 };
 
 }  // namespace dart
 
 #endif  // VM_FLOW_GRAPH_COMPILER_X64_H_