0.9.18.47:

0.9.18.47:
        Faster &MORE-handling VOPs on x86 and x86-64.

        * The performance of LOOP is really bad on modern x86, rewrite
          the loops in %LISTIFY-REST-ARGS and %MORE-ARG-VALUES to do
          the index manipulation and branching explicitly.
        * REP MOVS isn't very good for copying small blocks of memory, use
          an explicit loop in COPY-MORE-ARG.
        * Rewrite the x86-64 COPY-MORE-ARG to take advantage of the extra
          registers.
        * Implement %MORE-ARG (exists on all other platforms).