Fix ia64-linux ICE on bash.

Fix ia64-linux ICE on bash.
	* flow.c (struct reg_cond_life_info): New fields orig_condition
	and stores.
	(init_propagate_block_info): Set new fields.
	(mark_regno_cond_dead): Set and use new fields.
	(flush_reg_cond_reg_1): Likewise.
	(and_reg_cond, case AND): Check for redundant AND conditions.
	(mark_used_reg): Delete unnecessary clears before freeing splay trees.
	Set new fields.

git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@40881 138bc75d-0d04-0410-961f-82ee72b054a4