I wondered if clang has the same property, but it's explicitly coded as 10 (in lib/Lex/LiteralSupport.cpp):

    /// ProcessCharEscape - Parse a standard C escape sequence, which can occur in
    /// either a character or a string literal.
    static unsigned ProcessCharEscape(const char *ThisTokBegin,
                                      const char *&ThisTokBuf,
                                      const char *ThisTokEnd, bool &HadError,
                                      FullSourceLoc Loc, unsigned CharWidth,
                                      DiagnosticsEngine *Diags,
                                      const LangOptions &Features) {
      const char *EscapeBegin = ThisTokBuf;
      // Skip the '\' char.
      ++ThisTokBuf;
      // We know that this character can't be off the end of the buffer, because
      // that would have been \", which would not have been the end of string.
      unsigned ResultChar = *ThisTokBuf++;
      switch (ResultChar) {
    ...
      case 'n':
        ResultChar = 10;
        break;
    ...