message: core: ensure 'int' result from CV_POPCNT_U64(x)
diff: # ifdef _MSC_VER
  # include <nmmintrin.h>
  # if defined(_M_X64)
  -# define CV_POPCNT_U64 _mm_popcnt_u64
  +# define CV_POPCNT_U64 (int)_mm_popcnt_u64
  # endif
  # define CV_POPCNT_U32 _mm_popcnt_u32
  # else
  