* config/alpha/sync.md: Update comment about unpredictable LL/SC lock

	* config/alpha/sync.md: Update comment about unpredictable LL/SC lock
	clearing by a taken branch.
	(sync_<fetchop_name><mode>): Split when epilogue_completed is set,
	effectively after bbro pass.
	(sync_nand<mode>): Ditto.
	(sync_old_<fetchop_name><mode>): Ditto.
	(sync_old_nand<mode>): Ditto.
	(sync_new_<fetchop_name><mode>): Dito.
	(sync_new_nand<mode>): Ditto.
	(sync_compare_and_swap<mode>_1): Ditto.
	(*sync_compare_and_swap<mode>): Ditto.
	(sync_lock_test_and_set<mode>_1): Ditto.
	("sync_lock_test_and_set<mode>): Ditto.

git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@151115 138bc75d-0d04-0410-961f-82ee72b054a4