message: Remove comment about obsolete call to allocate_persistent from tfprof_node.cc
diff: @@ -160,10 +160,7 @@ void ExecStep::AddMemoryStats(const string& dev,
  // 'NodeExecStats.memory'.
  // 3. allocate_temp is only tracked through record_xxx_temp. It appears
  // in 'NodeExecStats.memory_stats'.
  - // 4. allocate_persistent calls allocate_tensor, which is properly tracked
  - // in 'NodeExecStats.memory'. However, there is no way to count it as
  - // persistent now.
  - // 5. record_xxx_persistent is called when allocate_persistent
  + // 4. record_xxx_persistent is called when allocate_persistent
  // is not used and hence tracks some complementary bytes. It appears in
  // 'NodeExecStats.memory_stats'. It's suspicious. But we should
  // use it now since it covers constant op.
  