message: [XLA] Don't print LLVM IR to stdout if the user specifies just --xla_dump_hlo_as_url.
  This flag alone means you probably just want the rendered HLO graphs printed to
  stdout and nothing more.  If you do want the LLVM IR printed to stdout, just
  add --xla_dump_hlo_as_text.
diff: @@ -48,22 +48,27 @@ struct CanonicalDebugOptions {
  // function we treat this struct's members as write-only, and read only from
  // `opts`.
  - // If dump_to is empty, default to dumping to stdout.
  - if (opts.xla_dump_to().empty()) {
  - dump_to = "-";
  - }
  -
  // Did the user specifiy an explicit format for dumping?
  - bool output_format_specified =
  + bool output_format_other_than_url_specified =
  opts.xla_dump_hlo_as_text() || opts.xla_dump_hlo_as_proto() ||
  opts.xla_dump_hlo_as_dot() || opts.xla_dump_hlo_as_html() ||
  - opts.xla_dump_hlo_as_url() || opts.xla_dump_hlo_snapshots();
  + opts.xla_dump_hlo_snapshots();
  + bool output_format_specified =
  + output_format_other_than_url_specified || opts.xla_dump_hlo_as_url();
  // If we haven't specified an output format, default to dumping as text.
  if (!output_format_specified) {
  dump_as_text = true;
  }
  + // If dump_to is empty, default to dumping to stdout, so long as some dump
  + // format other than dump-as-url was specified. If the user only specified
  + // --xla_dump_hlo_as_url, then don't dump to stdout, that is likely noise
  + // they don't want.
  + if (opts.xla_dump_to().empty() && output_format_other_than_url_specified) {
  + dump_to = "-";
  + }
  +
  // If we specified a regular expression restricting which modules to dump,
  // respect that.
  //
  @@ -143,6 +148,10 @@ void DumpToFileInDirImpl(string_view filename, string_view contents,
  return;
  }
  + if (opts.dump_to.empty()) {
  + return;
  + }
  +
  const string& dir = opts.dump_to;
  VLOG(1) << "Dumping " << filename << " to " << dir;
  