tree-ssa-strlen.c (printf_strlen_execute): Initialize the loop optimizer and SCEV before sizing ssa_ver_to_stridx.

	* tree-ssa-strlen.c (printf_strlen_execute): Initialize
	the loop optimizer and SCEV before sizing ssa_ver_to_stridx.

	* gcc.c-torture/compile/20190827-1.c: New test.

From-SVN: r274975