Revert "Precisely sweeping of scan-on-scavenge pages."

src/heap.h

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef V8_HEAP_H_
 #define V8_HEAP_H_
 
 #include <cmath>
 
 #include "src/allocation.h"
@@ skipping 1680 matching lines @@
   static int GcSafeSizeOfOldObject(HeapObject* object);
 
   // Update the GC state. Called from the mark-compact collector.
   void MarkMapPointersAsEncoded(bool encoded) {
     ASSERT(!encoded);
     gc_safe_size_of_old_object_ = &GcSafeSizeOfOldObject;
   }
 
   // Code that should be run before and after each GC.  Includes some
   // reporting/verification activities when compiled with DEBUG set.
-  void GarbageCollectionPrologue(GarbageCollector collector);
+  void GarbageCollectionPrologue();
   void GarbageCollectionEpilogue();
 
   // Pretenuring decisions are made based on feedback collected during new
   // space evacuation. Note that between feedback collection and calling this
   // method object in old space must not move.
   // Right now we only process pretenuring feedback in high promotion mode.
   void ProcessPretenuringFeedback();
 
   // Checks whether a global GC is necessary
   GarbageCollector SelectGarbageCollector(AllocationSpace space,
@@ skipping 1068 matching lines @@
   DisallowHeapAllocation no_allocation;  // i.e. no gc allowed.
 
  private:
   DISALLOW_IMPLICIT_CONSTRUCTORS(PathTracer);
 };
 #endif  // DEBUG
 
 } }  // namespace v8::internal
 
 #endif  // V8_HEAP_H_