re PR tree-optimization/68327 (ICE on valid code at -O3 on x86_64-linux-gnu in vect_i...

re PR tree-optimization/68327 (ICE on valid code at -O3 on x86_64-linux-gnu in vect_is_simple_use, at tree-vect-stmts.c:8562)

gcc/

	PR tree-optimization/68327
	* tree-vect-loop.c (vect_determine_vectorization_factor): Don't
	compute vectype for non-relevant mask producers.
	* gcc/tree-vect-stmts.c (vectorizable_comparison): Check stmt
	relevance earlier.

gcc/testsuite/

	PR tree-optimization/68327
	* gcc.dg/pr68327.c: New test.

Co-Authored-By: Richard Biener <rguenther@suse.de>
From-SVN: r230743