re PR fortran/88229 (ICE tree check: expected integer_cst, have nop_expr in get_len, at tree.h:5608)

2018-11-28  Richard Biener  <rguenther@suse.de>

	PR tree-optimization/88229
	* tree-ssa.c (non_rewritable_mem_ref_base): Check DECL_SIZE_UNIT
	is an INTEGER_CST before accessing it so.

From-SVN: r266550