simd-js: add some intermediary casts to void*
simd-js: add some intermediary casts to void*

This silences a clang warning about casting from int32_t* to __m128i*
increasing alignment requirements. The functions in question are
explicitly for unaligned destinations, but the SSE2 API uses __m128i*.
Basically, I blame Intel.

nemequ/simde,nemequ/simde,nemequ/simde