message: [XLA] Fix a bug in hlo_lexer that it got into a infinit loop when there is any
  illegal character in a comment.
diff: @@ -163,6 +163,9 @@ TokKind HloLexer::LexToken() {
  current_ptr_ = comment_start;
  return TokKind::kError;
  }
  + if (current == kError) {
  + return TokKind::kError;
  + }
  }
  // Return no token for the comment. Keep lexing.
  continue;
  @@ -177,6 +180,9 @@ TokKind HloLexer::LexToken() {
  if (current == kEOF || current == '\n' || current == '\r') {
  break;
  }
  + if (current == kError) {
  + return TokKind::kError;
  + }
  current_ptr_++;
  }
  continue;
  