re PR rtl-optimization/18861 (ICE Segmentation fault in try_crossjump_to_edge at ../../gcc/gcc/cfgcleanup.c:1637 with two switches (table jumps))

	PR rtl-optimization/18861
	* cfgbuild.c (BLOCK_USED_BY_TABLEJUMP): Define.
	(FULL_STATE): Define.
	(mark_tablejump_edge): New function.
	(purge_dead_tablejump_edges): New function.
	(find_bb_boundaries): Use it.

	* gcc.dg/20050105-1.c: New test.

From-SVN: r93041