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

src/heap/heap-inl.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_HEAP_INL_H_
 #define V8_HEAP_HEAP_INL_H_
 
 #include <cmath>
 
 #include "src/base/platform/platform.h"
@@ skipping 233 matching lines @@
     allocation = map_space_->AllocateRawUnaligned(size_in_bytes);
   } else {
     // NEW_SPACE is not allowed here.
     UNREACHABLE();
   }
   if (allocation.To(&object)) {
     OnAllocationEvent(object, size_in_bytes);
   } else {
     old_gen_exhausted_ = true;
   }
+
+  if (!old_gen_exhausted_ && incremental_marking()->black_allocation() &&
+      space != OLD_SPACE) {
+    Marking::MarkBlack(Marking::MarkBitFrom(object));
+    MemoryChunk::IncrementLiveBytesFromGC(object, size_in_bytes);
+  }
   return allocation;
 }
 
 
 void Heap::OnAllocationEvent(HeapObject* object, int size_in_bytes) {
   HeapProfiler* profiler = isolate_->heap_profiler();
   if (profiler->is_tracking_allocations()) {
     profiler->AllocationEvent(object->address(), size_in_bytes);
   }
 
@@ skipping 453 matching lines @@
 
 void VerifySmisVisitor::VisitPointers(Object** start, Object** end) {
   for (Object** current = start; current < end; current++) {
     CHECK((*current)->IsSmi());
   }
 }
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_HEAP_HEAP_INL_H_