message: Remove vacuous `DCHECK`
  Remove a `DCHECK_EQ(a, b)` found on the else branch of a `if (a != b)`. Since it is on the else branch, this means that `a` and `b` are already the same, so the `DCHECK` only generates code bloat when enabled.
diff: @@ -276,7 +276,6 @@ void TensorShapeRep::SlowCopyFrom(const TensorShapeRep& b) {
  // set_ndims_byte(b.ndims_byte());
  // set_data_type(b.data_type());
  } else {
  - DCHECK_EQ(b.tag(), REP_OUT_OF_LINE);
  set_ndims_byte(b.ndims_byte());
  set_data_type(b.data_type());
  if (tag() == REP_OUT_OF_LINE) {
  