Started porting inlined type checks to x64 (will be the future pattern for other architectures).

runtime/vm/flow_graph_compiler_x64.h

Index: runtime/vm/flow_graph_compiler_x64.h
===================================================================
--- runtime/vm/flow_graph_compiler_x64.h	(revision 7823)
+++ runtime/vm/flow_graph_compiler_x64.h	(working copy)
@@ -117,12 +117,43 @@
                             intptr_t token_index,
                             intptr_t try_index);
 
+  // Type checking helper methods.
+  void CheckClasses(const GrowableArray<const Class*>& classes,
+                    Label* is_instance_lbl,
+                    Label* is_not_instance_lbl);
   RawSubtypeTestCache* GenerateInlineInstanceof(intptr_t cid,
                                                 intptr_t token_index,
                                                 const AbstractType& type,
                                                 Label* is_instance,
                                                 Label* is_not_instance);
 
+  RawSubtypeTestCache* GenerateInstantiatedTypeWithArgumentsTest(
+      intptr_t cid,
+      intptr_t token_index,
+      const AbstractType& dst_type,
+      Label* is_instance_lbl,
+      Label* is_not_instance_lbl);
+
+  void GenerateInstantiatedTypeNoArgumentsTest(intptr_t cid,
+                                               intptr_t token_index,
+                                               const AbstractType& dst_type,
+                                               Label* is_instance_lbl,
+                                               Label* is_not_instance_lbl);
+
+  RawSubtypeTestCache* GenerateUninstantiatedTypeTest(
+      const AbstractType& dst_type,
+      intptr_t cid,
+      intptr_t token_index,
+      Label* is_instance_lbl,
+      Label* is_not_instance_label);
+
+  RawSubtypeTestCache* GenerateSubtype1TestCacheLookup(
+      intptr_t cid,
+      intptr_t token_index,
+      const Class& type_class,
+      Label* is_instance_lbl,
+      Label* is_not_instance_lbl);
+
   void GenerateAssertAssignable(intptr_t cid,
                                 intptr_t token_index,
                                 intptr_t try_index,