Fix pr60510.f test on arm-linux-gnueabihf

Only run the test if the target supports double precision vectorization.

gcc/testsuite/ChangeLog:

2017-07-07  Szabolcs Nagy  <szabolcs.nagy@arm.com>

	* gfortran.dg/vect/pr60510.f: Require vect_double support.

From-SVN: r250053

gcc/testsuite/ChangeLog

+2017-07-07  Szabolcs Nagy  <szabolcs.nagy@arm.com>
+
+	* gfortran.dg/vect/pr60510.f: Require vect_double support.
+
 2017-07-07  Carl Love  <cel@us.ibm.com>
 
 	* gcc.target/powerpc/builtins-1-p9-runnable.c: Add new test

gcc/testsuite/gfortran.dg/vect/pr60510.f

 ! { dg-do run }
+! { dg-require-effective-target vect_double }
 ! { dg-additional-options "-fno-inline -ffast-math" }
       subroutine foo(a,x,y,n)
       implicit none