GCM: move look-up table to .data section and unshare between processes
* cipher/cipher-gcm.c (ATTR_ALIGNED_64): New. (gcmR): Move to 'gcm_table' structure. (gcm_table): New structure for look-up table with counters before and after. (gcmR): New macro. (prefetch_table): Handle input with length not multiple of 256. (do_prefetch_tables): Modify pre- and post-table counters to unshare look-up table pages between processes.
- GnuPG-bug-id: T4541
- Signed-off-by: Jussi Kivilinna <firstname.lastname@example.org>