dec/developer: Add Valgrind / Address Sanitizer to the patch checklist

Reviewed-by: saste
Reviewed-by: Paul B Mahol <onemda@gmail.com>
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
swr/noise_shaping_data: pad coeffs to multiple of 4 when they are 1 below

This allows using code working with 4 at a time

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
swr: work with 4 noise shaping coeffs at a time

63->38 kcycles

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>