Reduce boot-up memory use of V8.

src/incremental-marking.cc

 // Copyright 2011 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 269 matching lines @@
 
 void IncrementalMarking::SetOldSpacePageFlags(MemoryChunk* chunk,
                                               bool is_marking,
                                               bool is_compacting) {
   if (is_marking) {
     chunk->SetFlag(MemoryChunk::POINTERS_TO_HERE_ARE_INTERESTING);
     chunk->SetFlag(MemoryChunk::POINTERS_FROM_HERE_ARE_INTERESTING);
 
     // It's difficult to filter out slots recorded for large objects.
     if (chunk->owner()->identity() == LO_SPACE &&
-        chunk->size() > static_cast<size_t>(Page::kPageSize) &&
+        chunk->size() > Page::kPageSize &&
         is_compacting) {
       chunk->SetFlag(MemoryChunk::RESCAN_ON_EVACUATION);
     }
   } else if (chunk->owner()->identity() == CELL_SPACE ||
              chunk->scan_on_scavenge()) {
     chunk->ClearFlag(MemoryChunk::POINTERS_TO_HERE_ARE_INTERESTING);
     chunk->ClearFlag(MemoryChunk::POINTERS_FROM_HERE_ARE_INTERESTING);
   } else {
     chunk->ClearFlag(MemoryChunk::POINTERS_TO_HERE_ARE_INTERESTING);
     chunk->SetFlag(MemoryChunk::POINTERS_FROM_HERE_ARE_INTERESTING);
@@ skipping 615 matching lines @@
   allocation_marking_factor_ = kInitialAllocationMarkingFactor;
   bytes_scanned_ = 0;
 }
 
 
 int64_t IncrementalMarking::SpaceLeftInOldSpace() {
   return heap_->MaxOldGenerationSize() - heap_->PromotedSpaceSize();
 }
 
 } }  // namespace v8::internal