Do not eagerly finalize classes in CHA, instead regard unfinalized classes as ’non-existent’ an…

runtime/vm/class_finalizer.h

Index: runtime/vm/class_finalizer.h
===================================================================
--- runtime/vm/class_finalizer.h	(revision 30540)
+++ runtime/vm/class_finalizer.h	(working copy)
@@ -78,11 +78,11 @@
   // Return false if we still have classes pending to be finalized.
   static bool AllClassesFinalized();
 
-  // Return whether class finalization failed.
+  // Return whether class interface finalization failed.
   // The function returns true if the finalization was successful.
   // If finalization fails, an error message is set in the sticky error field
   // in the object store.
-  static bool FinalizePendingClasses();
+  static bool FinalizePendingClassInterfaces();
 
   // Finalize the types appearing in the declaration of class 'cls', i.e. its
   // type parameters and their upper bounds, its super type and interfaces.