Remove cleanups from record-full.c

Remove cleanups from record-full.c

This removes cleanups from record-full.c.  In this case, the cleanups
were only ever run when an exception was thrown.  So, I replaced these
with try/catch, rather than introduce a new specialized RAII type.

Tested by the buildbot.

gdb/ChangeLog
2018-06-10  Tom Tromey  <tom@tromey.com>

	* record-full.c (record_full_arch_list_cleanups): Remove.
	(record_full_message): Use try/catch.
	(record_full_wait_cleanups): Remove.
	(record_full_wait_1): Use try/catch.
	(record_full_restore): Likewise.