message: Add necessary shape util support for bfloat16
  RELNOTES: Add necessary shape util support for bfloat16.
diff: @@ -592,10 +592,10 @@ StatusOr<Shape> ParseShapeStringInternal(tensorflow::StringPiece* s) {
  return sizeof(uint32);
  case U64:
  return sizeof(uint64);
  - case F16:
  - return sizeof(float) / 2;
  case BF16:
  return sizeof(float) / 2;
  + case F16:
  + return sizeof(float) / 2;
  case F32:
  return sizeof(float);
  case F64:
  