Implement eager instantiation and canonicalization of type arguments at run

runtime/vm/raw_object.cc

Index: runtime/vm/raw_object.cc
===================================================================
--- runtime/vm/raw_object.cc	(revision 32446)
+++ runtime/vm/raw_object.cc	(working copy)
@@ -329,14 +329,6 @@
 }
 
 
-intptr_t RawAbstractTypeArguments::VisitAbstractTypeArgumentsPointers(
-    RawAbstractTypeArguments* raw_obj, ObjectPointerVisitor* visitor) {
-  // RawAbstractTypeArguments is an abstract class.
-  UNREACHABLE();
-  return 0;
-}
-
-
 intptr_t RawTypeArguments::VisitTypeArgumentsPointers(
     RawTypeArguments* raw_obj, ObjectPointerVisitor* visitor) {
   intptr_t length = Smi::Value(raw_obj->ptr()->length_);
@@ -345,13 +337,6 @@
 }
 
 
-intptr_t RawInstantiatedTypeArguments::VisitInstantiatedTypeArgumentsPointers(
-    RawInstantiatedTypeArguments* raw_obj, ObjectPointerVisitor* visitor) {
-  visitor->VisitPointers(raw_obj->from(), raw_obj->to());
-  return InstantiatedTypeArguments::InstanceSize();
-}
-
-
 intptr_t RawPatchClass::VisitPatchClassPointers(RawPatchClass* raw_obj,
                                                 ObjectPointerVisitor* visitor) {
   visitor->VisitPointers(raw_obj->from(), raw_obj->to());