tree-optimization/105394 - vector lowering of compares

The following fixes missing handling of non-integer mode but
masked (SVE or MVE) compares in vector lowering by using the
appropriate mask element width to extract the components and
adjust the index.

2022-04-29  Richard Biener  <rguenther@suse.de>

	PR tree-optimization/105394
	* tree-vect-generic.cc (expand_vector_condition): Adjust
	comp_width for non-integer mode masks as well.