tree-vect-stmts.c (vect_is_simple_cond): When vectype is not specified still compute a comp_vectype for invariant compares.

2019-05-07  Richard Biener  <rguenther@suse.de>

	* tree-vect-stmts.c (vect_is_simple_cond): When vectype is
	not specified still compute a comp_vectype for invariant
	compares.

From-SVN: r270945