* expmed.h (NUM_MODE_VECTOR_INT): Define.
	(struct expmed_op_cheap, struct expmed_op_costs): New structures.
	(struct target_expmed): Convert x_mul_highpart_cost and
	x_mul_widen_cost fields to be indexed by integer modes.
	Convert x_sdiv_pow2_cheap and x_smod_pow2_cheap fields to be
	of type struct expmed_op_cheap.  Convert other cost fields to be
	of type struct_expmed_op_costs.
	(mul_widen_cost_ptr, mul_highpart_cost_ptr): Adjust for new
	indexing of respective fields.
	(expmed_op_cheap_ptr): New function.
	(sdiv_pow2_cheap_ptr, smod_pow2_cheap_ptr): Call it.
	(expmed_op_cost_ptr): New function.
	(add_cost_ptr, neg_cost_ptr, shift_cost_ptr, shiftadd_cost_ptr,
	shiftsub0_cost_ptr, shiftsub1_cost_ptr, mul_cost_ptr,
	sdiv_cost_ptr, udiv_cost_ptr): Call it.

From-SVN: r189994