* simplify-rtx.c (cfc_args): add "unordered" field.

	* simplify-rtx.c (cfc_args): add "unordered" field.
	(check_fold_consts): Set unordered field.
	(simplify_relational_operation): Simplify the unordered
	comparisons.

	* reg-stack.c (swap_rtx_condition): Ensure that the transformation
	is valid.

	* emit-rtl.c (try_split): Fix code to mark labels.
	* jump.c (mark_jump_label): Make global.
	* rtl.h (mark_jump_label): Declare.

	* predict.c (estimate_probability): Handle unordred comparisons.

git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@38711 138bc75d-0d04-0410-961f-82ee72b054a4