ssse3: many new or improved NEON implementations of pairwise functions
ssse3: many new or improved NEON implementations of pairwise functions

Some of these are just a matter of using vuzp instead of vuzp1/2 so
they work on armv7.  Others add vpadd-based AArch64 versions, and
there are also a few where there weren't any NEON implementations
before.

nemequ/simde,nemequ/simde,nemequ/simde