message: Fix printing of Swift strings
diff: @@ -81,6 +81,7 @@ static bool readStringFromAddress(
  read_options.SetProcessSP(process);
  read_options.SetStream(&stream);
  read_options.SetSourceSize(length);
  + read_options.SetHasSourceSize(true);
  read_options.SetNeedsZeroTermination(false);
  read_options.SetIgnoreMaxLength(summary_options.GetCapping() ==
  lldb::eTypeSummaryUncapped);
  @@ -282,7 +283,7 @@ bool lldb_private::formatters::swift::StringGuts_SummaryProvider(
  .SetSourceSize(count)
  .SetBinaryZeroIsTerminator(false)
  .SetLanguage(lldb::eLanguageTypeSwift);
  -
  + options.SetHasSourceSize(true);
  return StringPrinter::ReadBufferAndDumpToStream<
  StringPrinter::StringElementType::UTF8>(options);
  @@ -410,6 +411,7 @@ bool lldb_private::formatters::swift::StaticString_SummaryProvider(
  read_options.SetProcessSP(process_sp);
  read_options.SetLocation(start_ptr);
  read_options.SetSourceSize(size);
  + read_options.SetHasSourceSize(true);
  read_options.SetBinaryZeroIsTerminator(false);
  read_options.SetNeedsZeroTermination(false);
  read_options.SetStream(&stream);
  