[Patch Obvious] gcc.dg/vect/bb-slp-pr68892.c requires vectorization of doubles

gcc/testsuite/

	* gcc.dg/vect/bb-slp-pr68892.c: Require vect_double.

From-SVN: r232731

gcc/testsuite/ChangeLog

+2016-01-22  James Greenhalgh  <james.greenhalgh@arm.com>
+
+	* gcc.dg/vect/bb-slp-pr68892.c: Require vect_double.
+
 2016-01-21  Christian Bruel  <christian.bruel@st.com>
 
 	PR target/68674

gcc/testsuite/gcc.dg/vect/bb-slp-pr68892.c

 /* { dg-do compile } */
 /* { dg-additional-options "-fvect-cost-model=dynamic" } */
+/* { dg-require-effective-target vect_double } */
 
 double a[128][128];
 double b[128];