Turn zone_excess_limit_ into a constant.

src/zone-inl.h

 // Copyright 2012 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 56 matching lines @@
 }
 
 
 template <typename T>
 T* Zone::NewArray(int length) {
   return static_cast<T*>(New(length * sizeof(T)));
 }
 
 
 bool Zone::excess_allocation() {
-  return segment_bytes_allocated_ > zone_excess_limit_;
+  return segment_bytes_allocated_ > kExcessLimit;
 }
 
 
 void Zone::adjust_segment_bytes_allocated(int delta) {
   segment_bytes_allocated_ += delta;
   isolate_->counters()->zone_segment_bytes()->Set(segment_bytes_allocated_);
 }
 
 
 template <typename Config>
@@ skipping 17 matching lines @@
 
 template <typename T>
 void* ZoneList<T>::operator new(size_t size, Zone* zone) {
   return zone->New(static_cast<int>(size));
 }
 
 
 } }  // namespace v8::internal
 
 #endif  // V8_ZONE_INL_H_