2018-03-03  Steven G. Kargl  <kargl@gcc.gnu.org>

	PR fortran/66128
	* simplify.c (is_size_zero_array): New function to check for size
	zero array.
	(gfc_simplify_all, gfc_simplify_any, gfc_simplify_count, 
	 gfc_simplify_iall, gfc_simplify_iany, gfc_simplify_iparity,
	 gfc_simplify_minval, gfc_simplify_maxval, gfc_simplify_norm2,
	 gfc_simplify_product, gfc_simplify_sum): Use it, and implement
	requirements from F2018.

2018-03-03  Steven G. Kargl  <kargl@gcc.gnu.org>

	PR fortran/66128
	* gfortran.dg/zero_sized_8.f90: New test.

From-SVN: r258223