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

runtime/vm/class_finalizer.h

 // Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 #ifndef VM_CLASS_FINALIZER_H_
 #define VM_CLASS_FINALIZER_H_
 
 #include "vm/allocation.h"
 #include "vm/growable_array.h"
 
@@ skipping 60 matching lines @@
   // string and its arguments.
   static void FinalizeMalboundedType(const Error& prev_error,
                                      const Script& script,
                                      const Type& type,
                                      const char* format, ...)
        PRINTF_ATTRIBUTE(4, 5);
 
   // Return false if we still have classes pending to be finalized.
   static bool AllClassesFinalized();
 
-  // Return whether class finalization failed.
+  // Return whether type hierarchy 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 FinalizeTypeHierarchy();
 
   // Finalize the types appearing in the declaration of class 'cls', i.e. its
   // type parameters and their upper bounds, its super type and interfaces.
   // Note that the fields and functions have not been parsed yet (unless cls
   // is an anonymous top level class).
   static void FinalizeTypesInClass(const Class& cls);
 
   // Finalize the class including its fields and functions.
   static void FinalizeClass(const Class& cls);
 
@@ skipping 69 matching lines @@
                           const char* format, ...) PRINTF_ATTRIBUTE(4, 5);
 
   // Verify implicit offsets recorded in the VM for direct access to fields of
   // Dart instances (e.g: _TypedListView, _ByteDataView).
   static void VerifyImplicitFieldOffsets();
 };
 
 }  // namespace dart
 
 #endif  // VM_CLASS_FINALIZER_H_