fwprop.c (PR_CAN_APPEAR, [...]): New.

2008-04-02  Paolo Bonzini  <bonzini@gnu.org>

	* fwprop.c (PR_CAN_APPEAR, PR_HANDLE_MEM): New.
	(propagate_rtx_1): Handle PR_HANDLE_MEM.
	(propagate_rtx): Pass PR_HANDLE_MEM if appropriate.
	(varying_mem_p): Move above propagate_rtx.
	(all_uses_available_at): Do not check MEMs.

From-SVN: r133828