volk: adding popcnt puppets to qa
volk: add neon kernel for 16i_32fc_dot_prod_32fc
volk: add neon protokernel for 16i_s32f_convert_32f.

This is slower than the generic on gcc 4.8, but it's worth keeping
around. It's not possible to duplicate what gcc is doing with intrinsics,
but we can get close using 2 lanes.
volk: add neon version for 32f_binary_slicer_8i
volk: removed unused variable from neon binary slicer
volk: add neon version of 32u_byteswap

The QA needed a puppet because qa_utils only checks output buffers,
so this also introduces a puppet
volk: update profile to use the new 32u_byteswap puppet
volk: add neon versions for 32i bitwise operators