PR tree-optimization/85826 - ICE in gimple-ssa-warn-restruct on
   a variable-length struct

gcc/ChangeLog:

	PR tree-optimization/85826
	* gimple-ssa-warn-restrict.c (builtin_memref::builtin_memref): Avoid
	assuming that a DECL necesarily has a constant size.

gcc/testsuite/ChangeLog:

	PR tree-optimization/85826
	* gcc.dg/Wrestrict-17.c: New test.

From-SVN: r260537