vect: Add bool pattern handling for COND_OPs.

In order to handle masks properly for conditional operations this patch
teaches vect_recog_mask_conversion_pattern to also handle conditional
operations.  Now we convert e.g.

 _mask = *_6;
 _ifc123 = COND_OP (_mask, ...);

into
 _mask = *_6;
 patt200 = (<signed-boolean:1>) _mask;
 patt201 = COND_OP (patt200, ...);

This way the mask will be properly recognized as boolean mask and the
correct vector mask will be generated.

gcc/ChangeLog:

	PR middle-end/112406

	* tree-vect-patterns.cc (vect_recog_mask_conversion_pattern):
	Convert masks for conditional operations as well.

gcc/testsuite/ChangeLog:

	* gfortran.dg/pr112406.f90: New test.

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