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

runtime/vm/raw_object.cc

Index: runtime/vm/raw_object.cc
===================================================================
--- runtime/vm/raw_object.cc	(revision 7302)
+++ runtime/vm/raw_object.cc	(working copy)
@@ -454,12 +454,20 @@
 intptr_t RawICData::VisitICDataPointers(RawICData* raw_obj,
                                         ObjectPointerVisitor* visitor) {
   // Make sure that we got here with the tagged pointer as this.
-  ASSERT(raw_obj->IsHeapObject());
   visitor->VisitPointers(raw_obj->from(), raw_obj->to());
   return ICData::InstanceSize();
 }
 
 
+intptr_t RawSubtypeTestCache::VisitSubtypeTestCachePointers(
+    RawSubtypeTestCache* raw_obj, ObjectPointerVisitor* visitor) {
+  // Make sure that we got here with the tagged pointer as this.
+  RawSubtypeTestCache* obj = raw_obj->ptr();
+  visitor->VisitPointer(reinterpret_cast<RawObject**>(&obj->cache_));
+  return SubtypeTestCache::InstanceSize();
+}
+
+
 intptr_t RawError::VisitErrorPointers(RawError* raw_obj,
                                       ObjectPointerVisitor* visitor) {
   // Error is an abstract class.