message: Capture status value by reference to avoid copies
diff: @@ -68,7 +68,7 @@ namespace tensorflow {
  #define OP_REQUIRES_OK_ASYNC(CTX, STATUS, CALLBACK) \
  do { \
  - ::tensorflow::Status _s(STATUS); \
  + const ::tensorflow::Status& _s(STATUS); \
  if (!TF_PREDICT_TRUE(_s.ok())) { \
  (CTX)->CtxFailureWithWarning(__FILE__, __LINE__, _s); \
  (CALLBACK)(); \
  