* gimplify.c (compare_case_labels): New function.
	(gimplify_switch_expr): Sort case labels, and make sure the
	last label in the label vector is the default case.
	* tree-cfg.c (group_case_labels): New function.
	(build_tree_cfg): Cleanup redundant labels and group case labels
	before creating edges.
	(cleanup_dead_labels): Handle GOTO_EXPRs.
	(find_case_label_for_value): Use a binary search to find the
	case label for the given value.
	* tree-gimple.c: Mention that labels are sorted, and that the
	last label must be the default.

From-SVN: r82297