Use _mm_store_epi64 instead of _mm_cvtsi128_si64
Use _mm_store_epi64 instead of _mm_cvtsi128_si64

Fix 32-bit builds that tend to lack the cvt intrinsic. Hope it will be
optimized to a movq r64, xmm on modern platforms though

ultravideo/kvazaar,ultravideo/kvazaar,ultravideo/kvazaar,ultravideo/kvazaar,ultravideo/kvazaar