lra-constraints.c (emit_spill_move): Use smaller mode for mem-mem moves.

2013-05-24  Vladimir Makarov  <vmakarov@redhat.com>

        * lra-constraints.c (emit_spill_move): Use smaller mode for
	mem-mem moves.
        (check_and_process_move): Consider mem-reg moves for secondary
	too.
        (curr_insn_transform): Don't lose insns emitted before for
	secondary memory moves.
	(inherit_in_ebb): Mark defined reg.  Add usage only if it is not a
	reg set up in the current insn.

From-SVN: r199298