Using SubtypeTestCache object instead of an array, that way we do not need to patch and can communi…

runtime/vm/code_generator.h

Index: runtime/vm/code_generator.h
===================================================================
--- runtime/vm/code_generator.h	(revision 7302)
+++ runtime/vm/code_generator.h	(working copy)
@@ -125,19 +125,6 @@
 };
 
 
-// A subtype test cache is an array remembering subtype tests for given values.
-class SubTypeTestCache : public AllStatic {
- public:
-  enum Entries {
-    kInstanceClass = 0,
-    kInstanceTypeArguments = 1,
-    kInstantiatorTypeArguments = 2,
-    kTestResult = 3,
-    kNumEntries  = 4,
-  };
-};
-
-
 RawCode* ResolveCompileInstanceCallTarget(Isolate* isolate,
                                           const Instance& receiver);