Fix bug in MP_ALIGN macro that always truncated pointers to 32-bits, even on 64-bin platforms.  Bug 298630. r=rrelyea.
Fix bug in MP_ALIGN macro that always truncated pointers to 32-bits,
even on 64-bin platforms.  Bug 298630. r=rrelyea.

ekr/nss-old,ekr/nss-old,ekr/nss-old,nmav/nss,nmav/nss,ekr/nss-old,ekr/nss-old,ekr/nss-old,nmav/nss,nmav/nss,nmav/nss,ekr/nss-old,nmav/nss,nmav/nss