testsuite/92177 fix for SLP build changes

We're now consistently building SLP operations with only
scalar defs from scalars which makes the testcase no longer
testing multiplication vectorization.  The following smuggles
in a constant making the vector variant profitable for SLP build.

2020-02-05  Richard Biener  <rguenther@suse.de>

	PR testsuite/92177
	* gcc.dg/vect/bb-slp-22.c: Adjust.

gcc/testsuite/ChangeLog

 2020-02-05  Richard Biener  <rguenther@suse.de>
 
+	PR testsuite/92177
+	* gcc.dg/vect/bb-slp-22.c: Adjust.
+
+2020-02-05  Richard Biener  <rguenther@suse.de>
+
 	PR middle-end/90648
-	* genmatch.c (dt_node::gen_kids_1): Emit number of argument
-	checks before matching calls.
+	* gcc.dg/pr90648.c: New testcase.
 
 2020-02-05  Jakub Jelinek  <jakub@redhat.com>
 

gcc/testsuite/gcc.dg/vect/bb-slp-22.c

@@ -29,10 +29,10 @@ main1 (unsigned int x, unsigned int y)
     }
   else
     {
-      out[0] = a0 * x;
-      out[1] = a1 * y;
-      out[2] = a2 * x;
-      out[3] = a3 * y;
+      out[0] = a0 * (x + 1);
+      out[1] = a1 * (y + 1);
+      out[2] = a2 * (x + 1);
+      out[3] = a3 * (y + 1);
     }
 
   if (x)
@@ -40,10 +40,10 @@ main1 (unsigned int x, unsigned int y)
 
   /* Check results.  */
   if ((x <= y 
-       && (out[0] != (in[0] + 23) * x
-           || out[1] != (in[1] + 142) * y
-           || out[2] != (in[2] + 2) * x
-           || out[3] != (in[3] + 31) * y))
+       && (out[0] != (in[0] + 23) * (x + 1)
+           || out[1] != (in[1] + 142) * (y + 1)
+           || out[2] != (in[2] + 2) * (x + 1)
+           || out[3] != (in[3] + 31) * (y + 1)))
        || (x > y
            && (b[0] != (in[0] + 23)
                || b[1] != (in[1] + 142)