Fix the GC branch so it compiles and runs on 64 bit.

src/store-buffer.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 353 matching lines @@
 void StoreBuffer::IteratePointersToNewSpace(ObjectSlotCallback callback) {
   // We do not sort or remove duplicated entries from the store buffer because
   // we expect that callback will rebuild the store buffer thus removing
   // all duplicates and pointers to old space.
   bool some_pages_to_scan = PrepareForIteration();
 
   Address* limit = old_top_;
   old_top_ = old_start_;
   {
     DontMoveStoreBufferEntriesScope scope(this);
-    if (FLAG_trace_gc) {
-      PrintF("Store buffer: %d entries\n", limit - old_start_);
-    }
     for (Address* current = old_start_; current < limit; current++) {
 #ifdef DEBUG
       Address* saved_top = old_top_;
 #endif
       Object** cell = reinterpret_cast<Object**>(*current);
       Object* object = *cell;
       // May be invalid if object is not in new space.
       HeapObject* heap_object = reinterpret_cast<HeapObject*>(object);
       if (heap_->InFromSpace(object)) {
         callback(reinterpret_cast<HeapObject**>(cell), heap_object);
@@ skipping 94 matching lines @@
 }
 
 
 void StoreBuffer::CheckForFullBuffer() {
   if (old_limit_ - old_top_ < kStoreBufferSize * 2) {
     HandleFullness();
   }
 }
 
 } }  // namespace v8::internal