re PR tree-optimization/86988 (ICE: tree check: expected integer_cst, have var_decl in get_len, at tree.h:5563)

2018-08-22  Richard Biener  <rguenther@suse.de>

	PR tree-optimization/86988
	* tree-vrp.c (vrp_prop::check_mem_ref): Bail out on VLAs.

	* g++.dg/pr86988.C: New testcase.

From-SVN: r263762