[committed] testsuite: Add a vect_element_align_preferred guard

[Richard Sandiford via Gcc-patches]

We don't try to increase the alignment of decls if
vect_element_align_preferred.

Tested on aarch64-linux-gnu (with and without SVE), arm-linux-gnueabihf
and x86_64-linux-gnu.  Pushed as obvious.

Richard


gcc/testsuite/
        * gcc.dg/vect/aligned-section-anchors-nest-1.c: XFAIL alignment
        test if vect_element_align_preferred.
---
 gcc/testsuite/gcc.dg/vect/aligned-section-anchors-nest-1.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/gcc/testsuite/gcc.dg/vect/aligned-section-anchors-nest-1.c 
b/gcc/testsuite/gcc.dg/vect/aligned-section-anchors-nest-1.c
index f8c36a89fc7..24b2fa86da2 100644
--- a/gcc/testsuite/gcc.dg/vect/aligned-section-anchors-nest-1.c
+++ b/gcc/testsuite/gcc.dg/vect/aligned-section-anchors-nest-1.c
@@ -30,4 +30,4 @@ int *foo(void)
   return &c[0][0];
 }
 
-/* { dg-final { scan-ipa-dump-times "Increasing alignment of decl" 3 
"increase_alignment" } } */
+/* { dg-final { scan-ipa-dump-times "Increasing alignment of decl" 3 
"increase_alignment" { xfail vect_element_align_preferred } } } */