Make more use of in_hard_reg_set_p

Make more use of in_hard_reg_set_p

An upcoming patch will convert hard_regno_nregs into an inline
function, which in turn allows hard_regno_nregs to be used as the
name of a targetm field.  This patch rewrites a use that can use
in_hard_reg_set_p instead.

2017-09-12  Richard Sandiford  <richard.sandiford@linaro.org>

gcc/
	* ira-costs.c (record_operand_costs): Use in_hard_reg_set_p
	instead of hard_regno_nregs.

From-SVN: r252013