tree-optimization/104595 - vectorization of COND_EXPR with bool load

tree-optimization/104595 - vectorization of COND_EXPR with bool load

The following fixes an omission in bool pattern detection that
makes it fail when check_bool_pattern fails for COND_EXPR.  That's
not what it should do, instead it should still pattern recog
to var != 0 even if no further adjustments to the def chain are
necessary when var is not a mask already.

2022-02-21  Richard Biener  <rguenther@suse.de>

	PR tree-optimization/104595
	* tree-vect-patterns.cc (vect_recog_bool_pattern): For
	COND_EXPR do not fail if check_bool_pattern returns false.

	* gcc.dg/vect/pr104595.c: New testcase.