[PATCH TEST]Require vect_perm in gcc.dg/vect/pr80815-3.c

[Bin Cheng]

Hi,
The test has negative step in memory access, thus can't be vectorized on
target like sparc-sun-solaris2.12.  This patch adds vect_perm requirement
for it.  Test result checked.  Is it OK?

Thanks,
bin
gcc/testsuite/ChangeLog
2017-07-20  Bin Cheng  <bin.ch...@arm.com>

        * gcc.dg/vect/pr80815-3.c: Require vect_perm.
diff --git a/gcc/testsuite/gcc.dg/vect/pr80815-3.c 
b/gcc/testsuite/gcc.dg/vect/pr80815-3.c
index dae01fa..50392ab 100644
--- a/gcc/testsuite/gcc.dg/vect/pr80815-3.c
+++ b/gcc/testsuite/gcc.dg/vect/pr80815-3.c
@@ -42,4 +42,4 @@ int main (void)
   return 0;
 }
 
-/* { dg-final { scan-tree-dump "improved number of alias checks from \[0-9\]* 
to 1" "vect" } } */
+/* { dg-final { scan-tree-dump "improved number of alias checks from \[0-9\]* 
to 1" "vect" { target vect_perm } } } */