[heap] Don't use black pages for map, code and, lo space. Instead color objects black.

src/heap/incremental-marking.cc

 // 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.
 
 #include "src/heap/incremental-marking.h"
 
 #include "src/code-stubs.h"
 #include "src/compilation-cache.h"
 #include "src/conversions.h"
 #include "src/heap/gc-idle-time-handler.h"
@@ skipping 553 matching lines @@
   // Ready to start incremental marking.
   if (FLAG_trace_incremental_marking) {
     PrintF("[IncrementalMarking] Running\n");
   }
 }
 
 void IncrementalMarking::StartBlackAllocation() {
   DCHECK(FLAG_black_allocation);
   DCHECK(IsMarking());
   black_allocation_ = true;
-  PagedSpaces spaces(heap());
-  for (PagedSpace* space = spaces.next(); space != NULL;
-       space = spaces.next()) {
-    space->EmptyAllocationInfo();
-    space->free_list()->Reset();
-  }
+  PagedSpaces* old_space = heap()->old_space();
+  old_space->EmptyAllocationInfo();
+  old_space->free_list()->Reset();
   if (FLAG_trace_incremental_marking) {
     PrintF("[IncrementalMarking] Black allocation started\n");
   }
 }
 
 void IncrementalMarking::FinishBlackAllocation() {
   black_allocation_ = false;
   if (FLAG_trace_incremental_marking) {
     PrintF("[IncrementalMarking] Black allocation finished\n");
   }
@@ skipping 636 matching lines @@
 void IncrementalMarking::IncrementIdleMarkingDelayCounter() {
   idle_marking_delay_counter_++;
 }
 
 
 void IncrementalMarking::ClearIdleMarkingDelayCounter() {
   idle_marking_delay_counter_ = 0;
 }
 }  // namespace internal
 }  // namespace v8