Use optab_libfunc to access sync_lock_test_and_set libfunc on hppa-linux.

2022-01-02  John David Anglin  <danglin@gcc.gnu.org>

gcc/ChangeLog:

	* config/pa/pa.md (atomic_storeq): Use optab_libfunc to access
	sync_lock_test_and_set libfunc. Call convert_memory_address to
	convert memory address to Pmode.
	(atomic_storehi, atomic_storesi, atomic_storedi): Likewise.