re PR tree-optimization/89710 (ICE in dyn_cast<gcond*, gimple>(gimple*) / should_duplicate_loop_header_p)

2019-03-14  Richard Biener  <rguenther@suse.de>

	PR tree-optimization/89710
	* tree-ssa-loop-ch.c (should_duplicate_loop_header_p): Use
	safe_dyn_cast.

	* gcc.dg/torture/pr89710.c: New testcase.

From-SVN: r269679