SKIPPED ANY ROLLBACK

trx_sys_any_active_transactions(): If any prepared ACTIVE transactions
exist, and their rollback was prevented by innodb_force_recovery,
convert these transactions to XA PREPARE state in the main-memory
data structures, so that shutdown will proceed normally. These transactions
will again recover as ACTIVE on the next restart, and they will be rolled
back unless innodb_force_recovery>=3 again.

trx_undo_fake_prepared(): An auxiliary function to set an undo log to
PREPARED state.

RB: 8610
Reviewed-by: Jimmy Yang <jimmy.yang@oracle.com>