It is called from print_statistics() in java.cpp:

 if (PrintCodeCache2) {
    MutexLocker mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
    CodeCache::print_internals();
  }

This is incorrect. However, with optimization turned on, PrintCodeCache2 resolves to a constant "false" and the compiler optimizes away the entire block.