gcc/

gcc/
	* lower-subreg.c (shift_cost): Use set_src_cost, avoiding the SET.
	(compute_costs): Likewise for the zero extension.  Use set_rtx_cost
	to compute the cost of moves.  Set the mode of the target register.

git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@187212 138bc75d-0d04-0410-961f-82ee72b054a4