target/109955 - handle pattern generated COND_EXPR without vcond

The following properly handles pattern matching generated COND_EXPRs
which can still have embedded compares in vectorizable_condition
which will always code generate the masked vector variant.  We
were requiring vcond with embedded comparisons instead of also
allowing (as code generated) split compare and VEC_COND_EXPR.

This fixes some of the fallout when removing vcond{,u,eq} expanders
from the x86 backend.

Bootstrapped and tested on x86_64-unknown-linux-gnu, pushed.

	PR target/109955
	* tree-vect-stmts.cc (vectorizable_condition): For
	embedded comparisons also handle the case when the target
	only provides vec_cmp and vcond_mask.

gcc/tree-vect-stmts.cc

@@ -10819,7 +10819,12 @@ vectorizable_condition (vec_info *vinfo,
       if (reduction_type == EXTRACT_LAST_REDUCTION)
 	/* Count one reduction-like operation per vector.  */
 	kind = vec_to_scalar;
-      else if (!expand_vec_cond_expr_p (vectype, comp_vectype, cond_code))
+      else if (!expand_vec_cond_expr_p (vectype, comp_vectype, cond_code)
+	       && (masked
+		   || (!expand_vec_cmp_expr_p (comp_vectype, vec_cmp_type,
+					       cond_code)
+		       || !expand_vec_cond_expr_p (vectype, vec_cmp_type,
+						   ERROR_MARK))))
 	return false;
 
       if (slp_node