test against the specified memory_alignment<Vec>::value and not some heuristic value
test against the specified memory_alignment<Vec>::value and not some heuristic value

VcDevel/Vc,chr-engwer/Vc,chr-engwer/Vc,chr-engwer/Vc,VcDevel/Vc,VcDevel/Vc,VcDevel/Vc