factor out alignment mask and request only 4-Byte alignment for double on 32-bit
factor out alignment mask and request only 4-Byte alignment for double on 32-bit

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