middle-end/104450 - ISEL and non-call EH

middle-end/104450 - ISEL and non-call EH

The following avoids merging a vector compare with EH with a
VEC_COND_EXPR.  We should be able to do fallback expansion and if
we really are for the optimization we need quite some shuffling
to arrange for the proper EH redirection in all cases, IMHO not
worth it.

2022-02-09  Richard Biener  <rguenther@suse.de>

	PR middle-end/104450
	* gimple-isel.cc: Pass cfun around.
	(+gimple_expand_vec_cond_expr): Do not combine a throwing
	comparison with the select.

	* g++.dg/torture/pr104450.C: New testcase.