Add counters for write barriers in optimized code.

src/v8-counters.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 224 matching lines @@
   SC(math_tan, V8.MathTan)                                            \
   SC(transcendental_cache_hit, V8.TranscendentalCacheHit)             \
   SC(transcendental_cache_miss, V8.TranscendentalCacheMiss)           \
   SC(stack_interrupts, V8.StackInterrupts)                            \
   SC(runtime_profiler_ticks, V8.RuntimeProfilerTicks)                 \
   SC(bounds_checks_eliminated, V8.BoundsChecksEliminated)             \
   SC(bounds_checks_hoisted, V8.BoundsChecksHoisted)                   \
   SC(soft_deopts_requested, V8.SoftDeoptsRequested)                   \
   SC(soft_deopts_inserted, V8.SoftDeoptsInserted)                     \
   SC(soft_deopts_executed, V8.SoftDeoptsExecuted)                     \
+  /* Number of write barriers in generated code. */                   \
+  SC(write_barriers_dynamic, V8.WriteBarriersDynamic)                 \
+  SC(write_barriers_static, V8.WriteBarriersStatic)                   \
   SC(new_space_bytes_available, V8.MemoryNewSpaceBytesAvailable)      \
   SC(new_space_bytes_committed, V8.MemoryNewSpaceBytesCommitted)      \
   SC(new_space_bytes_used, V8.MemoryNewSpaceBytesUsed)                \
   SC(old_pointer_space_bytes_available,                               \
      V8.MemoryOldPointerSpaceBytesAvailable)                          \
   SC(old_pointer_space_bytes_committed,                               \
      V8.MemoryOldPointerSpaceBytesCommitted)                          \
   SC(old_pointer_space_bytes_used, V8.MemoryOldPointerSpaceBytesUsed) \
   SC(old_data_space_bytes_available, V8.MemoryOldDataSpaceBytesAvailable) \
   SC(old_data_space_bytes_committed, V8.MemoryOldDataSpaceBytesCommitted) \
@@ skipping 137 matching lines @@
   friend class Isolate;
 
   explicit Counters(Isolate* isolate);
 
   DISALLOW_IMPLICIT_CONSTRUCTORS(Counters);
 };
 
 } }  // namespace v8::internal
 
 #endif  // V8_V8_COUNTERS_H_