Implemented the non 64 bit fallback for _mm_cvtps_epi32.  It does not yet appear to produce absolutely identical results as the ARMv8 'vcvtnq_s32_f32' intrinsic, but at least there's something there for now.
Implemented the non 64 bit fallback for _mm_cvtps_epi32.  It does not yet appear to produce absolutely identical results as the ARMv8 'vcvtnq_s32_f32' intrinsic, but at least there's something there for now.

DLTcollab/sse2neon,DLTcollab/sse2neon,DLTcollab/sse2neon