[Testsuite, committed] Fix vector peeling test failures

[Wilco Dijkstra]

This fixes a few failures on ARM and AArch64 due to a recent change in
alignment peeling by switching the vector cost model off
(https://gcc.gnu.org/ml/gcc-patches/2017-05/msg00407.html).

Tested on AArch64, ARM and x64 - committed as obvious.

ChangeLog: 
2017-05-08  Wilco Dijkstra  <wdijk...@arm.com>

        * testsuite/gcc.dg/vect/vect-44.c: Add -fno-vect-cost-model.
        * gcc/testsuite/gcc.dg/vect/vect-50.c: Likewise.
--

diff --git a/gcc/testsuite/gcc.dg/vect/vect-44.c 
b/gcc/testsuite/gcc.dg/vect/vect-44.c
index 
186f9cfc9e26d6eb53514dec0fac176d696ec578..fbc593572429422c8e527c5e5559c515efd38aa6
 100644
--- a/gcc/testsuite/gcc.dg/vect/vect-44.c
+++ b/gcc/testsuite/gcc.dg/vect/vect-44.c
@@ -1,4 +1,5 @@
 /* { dg-require-effective-target vect_float } */
+/* { dg-options "-fno-vect-cost-model" } */
 
 #include <stdarg.h>
 #include "tree-vect.h"
diff --git a/gcc/testsuite/gcc.dg/vect/vect-50.c 
b/gcc/testsuite/gcc.dg/vect/vect-50.c
index 
78bfd8d3920445fe51c7393a82870ea85f62bb55..0d5febc165ee3bf3b7b595237168d9d4b9604d4b
 100644
--- a/gcc/testsuite/gcc.dg/vect/vect-50.c
+++ b/gcc/testsuite/gcc.dg/vect/vect-50.c
@@ -1,4 +1,5 @@
 /* { dg-require-effective-target vect_float } */
+/* { dg-options "-fno-vect-cost-model" } */
 
 #include <stdarg.h>
 #include "tree-vect.h"