* genrecog.c (enum decision_type): Add DT_elt_zero-wide_safe.

	(add_to_sequence): Make that decision type.
	(maybe_both_true_2, nodes_identical_1, factor_tests): Use it.
	(write_switch, write_cond, debug_decision_2): Likewise.


git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@42285 138bc75d-0d04-0410-961f-82ee72b054a4