Fix arm XFAIL in cunroll-15.c

Remove the XFAIL on arm in cunroll-15.c since the test passes on trunk.
Committed as obvious.

testsuite/
	* gcc.dg/tree-ssa/cunroll-15.c: Remove XFAIL on arm.

From-SVN: r273088

gcc/testsuite/ChangeLog

+2019-07-04  Wilco Dijkstra  <wdijkstr@arm.com>
+
+	* gcc.dg/tree-ssa/cunroll-15.c: Remove XFAIL on arm.
+
 2019-07-04  Andrea Corallo <andrea.corallo@arm.com>
 
 	* jit.dg/all-non-failing-tests.h: Add test-accessing-bitfield.c.

gcc/testsuite/gcc.dg/tree-ssa/cunroll-15.c

@@ -20,4 +20,4 @@ int Test(void)
 /* When SLP vectorization is enabled the following will fail because DOM
    doesn't know how to deal with the vectorized initializer of in.  */
 /* DOM also doesn't know to CSE in[1] with in = *.LC0 thus the list of targets this fails.  */
-/* { dg-final { scan-tree-dump "return 1;" "optimized" { xfail { arm*-*-* powerpc-*-* } } } } */
+/* { dg-final { scan-tree-dump "return 1;" "optimized" { xfail { powerpc-*-* } } } } */