re PR tree-optimization/89572 (ICE in dyn_cast<gcond*, gimple>(gimple*) / get_loop_exit_condition(loop const*))

2019-03-04  Richard Biener  <rguenther@suse.de>

	PR middle-end/89572
	* tree-scalar-evolution.c: (get_loop_exit_condition): Use
	safe_dyn_cast.

	* gcc.dg/torture/pr89572.c: New testcase.

From-SVN: r269363