Fix the --max-old-space-size flag so it can be used on 64 bit for

src/incremental-marking-inl.h

 // 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 74 matching lines @@
   }
 }
 
 
 void IncrementalMarking::BlackToGreyAndUnshift(HeapObject* obj,
                                                MarkBit mark_bit) {
   ASSERT(Marking::MarkBitFrom(obj) == mark_bit);
   ASSERT(obj->Size() >= 2*kPointerSize);
   ASSERT(IsMarking());
   Marking::BlackToGrey(mark_bit);
+  int64_t old_bytes_rescanned = bytes_rescanned_;
+  bytes_rescanned_ = old_bytes_rescanned + obj->Size();
+  if ((bytes_rescanned_ >> 20) != (old_bytes_rescanned >> 20)) {
+    if (bytes_rescanned_ > 2 * heap_->PromotedSpaceSize()) {
+      // If we have queued twice the heap size for rescanning then we are
+      // going around in circles, scanning the same objects again and again
+      // as the program mutates the heap faster than we can incrementally
+      // trace it.  In this case we switch to non-incremental marking in
+      // order to finish off this marking phase.
+      if (FLAG_trace_gc) {
+        PrintF("Hurrying incremental marking because of lack of progress\n");
+      }
+      allocation_marking_factor_ = kMaxAllocationMarkingFactor;
+    }
+  }
 
   marking_deque_.UnshiftGrey(obj);
 }
 
 
 void IncrementalMarking::WhiteToGreyAndPush(HeapObject* obj, MarkBit mark_bit) {
   WhiteToGrey(obj, mark_bit);
   marking_deque_.PushGrey(obj);
 }
 
 
 void IncrementalMarking::WhiteToGrey(HeapObject* obj, MarkBit mark_bit) {
   ASSERT(Marking::MarkBitFrom(obj) == mark_bit);
   ASSERT(obj->Size() >= 2*kPointerSize);
   ASSERT(IsMarking());
   Marking::WhiteToGrey(mark_bit);
 }
 
 
 } }  // namespace v8::internal
 
 #endif  // V8_INCREMENTAL_MARKING_INL_H_