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

[James Greenhalgh]

Hi,

As title. This testcase fails on arm-none-linux-gnueabihf, because we don't
have vectorization of doubles there.

Committed as obvious as revision 232731.

Thanks,
James

---
2016-01-22  James Greenhalgh  <james.greenha...@arm.com>

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

diff --git a/gcc/testsuite/gcc.dg/vect/bb-slp-pr68892.c b/gcc/testsuite/gcc.dg/vect/bb-slp-pr68892.c
index 648fe481..ba51b76 100644
--- a/gcc/testsuite/gcc.dg/vect/bb-slp-pr68892.c
+++ b/gcc/testsuite/gcc.dg/vect/bb-slp-pr68892.c
@@ -1,5 +1,6 @@
 /* { dg-do compile } */
 /* { dg-additional-options "-fvect-cost-model=dynamic" } */
+/* { dg-require-effective-target vect_double } */
 
 double a[128][128];
 double b[128];