point3d: Do a compiler check for the SIMD read
point3d: Do a compiler check for the SIMD read

Apparently, Clang ≤ 3.5 has issues when doing a vectorised partial read
from a SIMD type into a pointer to a structure.

ebassi/graphene,ebassi/graphene,criptych/graphene,criptych/graphene,criptych/graphene,criptych/graphene