r257177 made the else arms equivalent to the if arms.

2018-02-08  Richard Sandiford  <richard.sandiford@linaro.org>

gcc/
	* lra-constraints.c (match_reload): Unconditionally use
	gen_lowpart_SUBREG, rather than selecting between that
	and equivalent gen_rtx_SUBREG code.

From-SVN: r257488