Remove support for object grouping during Garbage Collection

runtime/vm/verifier.cc

 // 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.
 
 #include "vm/verifier.h"
 
 #include "platform/assert.h"
 #include "vm/dart.h"
 #include "vm/dart_api_state.h"
 #include "vm/freelist.h"
@@ skipping 61 matching lines @@
 
 
 void VerifyPointersVisitor::VerifyPointers(MarkExpectation mark_expectation) {
   NoSafepointScope no_safepoint;
   Isolate* isolate = Isolate::Current();
   ObjectSet* allocated_set =
       isolate->heap()->CreateAllocatedObjectSet(mark_expectation);
   VerifyPointersVisitor visitor(isolate, allocated_set);
   // Visit all strongly reachable objects.
   isolate->IterateObjectPointers(&visitor,
-                                 false,  // skip prologue weak handles
                                  StackFrameIterator::kValidateFrames);
   VerifyWeakPointersVisitor weak_visitor(&visitor);
   // Visit weak handles and prologue weak handles.
-  isolate->VisitWeakPersistentHandles(&weak_visitor,
-                                      true);  // visit prologue weak handles
+  isolate->VisitWeakPersistentHandles(&weak_visitor);
   delete allocated_set;
 }
 
 }  // namespace dart