toplev.c (rest_of_compilation): Do jump threading before SSA path...

toplev.c (rest_of_compilation): Do jump threading before SSA path...

	* toplev.c (rest_of_compilation): Do jump threading before SSA path;
	consistently call delete_trivially_dead_insns after CSE and GCSE;
	fix DFI_life dumping; do jump threading after liveness; do crossjumping
	after liveness2; update comment in last crossjumping.
	* cfgcleanup.c (try_crossjump_to_edge): Dirtify block.

From-SVN: r50373