When path splitting tries to detect a CFG diamond make sure it
is composed of normal (non-EH, not abnormal) edges.  Otherwise
CFG manipulation later may fail.

2020-05-15  Richard Biener  <rguenther@suse.de>

	PR tree-optimization/95133
	* gimple-ssa-split-paths.c
	(find_block_to_duplicate_for_splitting_paths): Check for
	normal edges.

	* gcc.dg/pr95133.c: New testcase.