First part of new ICData infrastructure: use a wrapper object instead of an array.

runtime/vm/raw_object.cc

Index: runtime/vm/raw_object.cc
===================================================================
--- runtime/vm/raw_object.cc	(revision 4412)
+++ runtime/vm/raw_object.cc	(working copy)
@@ -637,4 +637,13 @@
   return JSRegExp::InstanceSize(length);
 }
 
+
+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());
+  return ICData::InstanceSize();
+}
+
+
 }  // namespace dart