Remove guard page mechanism from promotion queue.

src/heap/spaces.cc

 // Copyright 2011 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.
 
 #include "src/v8.h"
 
 #include "src/base/bits.h"
 #include "src/base/platform/platform.h"
 #include "src/full-codegen.h"
 #include "src/heap/mark-compact.h"
@@ skipping 1342 matching lines @@
   }
   if (!to_space_.AdvancePage()) {
     // Failed to get a new page in to-space.
     return false;
   }
 
   // Clear remainder of current page.
   Address limit = NewSpacePage::FromLimit(top)->area_end();
   if (heap()->gc_state() == Heap::SCAVENGE) {
     heap()->promotion_queue()->SetNewLimit(limit);
-    heap()->promotion_queue()->ActivateGuardIfOnTheSamePage();
   }
 
   int remaining_in_page = static_cast<int>(limit - top);
   heap()->CreateFillerObjectAt(top, remaining_in_page);
   pages_used_++;
   UpdateAllocationInfo();
 
   return true;
 }
 
@@ skipping 1724 matching lines @@
     object->ShortPrint();
     PrintF("\n");
   }
   printf(" --------------------------------------\n");
   printf(" Marked: %x, LiveCount: %x\n", mark_size, LiveBytes());
 }
 
 #endif  // DEBUG
 }
 }  // namespace v8::internal