[PATCH] Ping of ccmp.c (conditional compare) patch

[Steve Ellcey]

This is a re-ping of:

        https://gcc.gnu.org/ml/gcc-patches/2017-05/msg00021.html

It was pointed out to me that my original subject line [PATCH/AARCH64] might
be misleading since the patch is not to code in config/aarch64.  It is to
ccmp.c which is in the shared gcc directory.  That said, aarch64 is currently
the only architecture that uses this code because it is the only architecture
that sets targetm.gen_ccmp_first and targetm.gen_ccmp_next.

Steve Ellcey