ix86: fix PR/65105 testcase 2

I cannot see how without allowing the compiler to use SSE2 instructions
(as is done by all other tests for this PR scanning for particular
instructions) this test could ever have succeeded anywhere.

gcc/testsuite/
2016-07-01  Jan Beulich  <jbeulich@suse.com>

	* gcc.target/i386/pr65105-2.c: Add -msse2.

From-SVN: r237908

gcc/testsuite/ChangeLog

+2016-07-01  Jan Beulich  <jbeulich@suse.com>
+
+	* gcc.target/i386/pr65105-2.c: Add -msse2.
+
 2016-06-30  Jakub Jelinek  <jakub@redhat.com>
 
 	PR tree-optimization/71707

gcc/testsuite/gcc.target/i386/pr65105-2.c

 /* PR target/pr65105 */
 /* { dg-do compile { target { ia32 } } } */
-/* { dg-options "-O2" } */
+/* { dg-options "-O2 -msse2" } */
 /* { dg-final { scan-assembler "por" } } */
 
 long long i1, i2, res;