target: add to_record_will_replay target method

target: add to_record_will_replay target method

Add a new target method to_record_will_replay to query if there is a record
target that will replay at least one thread matching the argument PTID if it
were executed in the argument execution direction.

gdb/
	* record-btrace.c ((record_btrace_will_replay): New.
	(init_record_btrace_ops): Initialize to_record_will_replay.
	* record-full.c ((record_full_will_replay): New.
	(init_record_full_ops): Initialize to_record_will_replay.
	* target-delegates.c: Regenerated.
	* target.c (target_record_will_replay): New.
	* target.h (struct target_ops) <to_record_will_replay>: New.
	(target_record_will_replay): New.

Signed-off-by: Markus Metzger <markus.t.metzger@intel.com>