message: Use md5 dwarf hash, only if all files has it
diff: @@ -76,7 +76,7 @@ fn line_program_add_file(
  let info = make_file_info(file.src_hash);
  - line_program.file_has_md5 = info.is_some();
  + line_program.file_has_md5 &= info.is_some();
  line_program.add_file(file_name, dir_id, info)
  }
  // FIXME give more appropriate file names
  