Use -fcf-protection=return in cet-intrin-4.c

Since -fcf-protection requires both -mshstk and -mibt, use
-fcf-protection=return with -mshstk in cet-intrin-4.c.

	PR target/84243
	* gcc.target/i386/cet-intrin-4.c (dg-options): Use
	-fcf-protection=return.

From-SVN: r257445

gcc/testsuite/ChangeLog

+2018-02-07  H.J. Lu  <hongjiu.lu@intel.com>
+
+	PR target/84243
+	* gcc.target/i386/cet-intrin-4.c (dg-options): Use
+	-fcf-protection=return.
+
 2018-02-07  Tom de Vries  <tom@codesourcery.com>
 
 	PR libgomp/84217

gcc/testsuite/gcc.target/i386/cet-intrin-4.c

 /* { dg-do compile } */
-/* { dg-options "-O -fcf-protection -mshstk" } */
+/* { dg-options "-O -fcf-protection=return -mshstk" } */
 /* { dg-final { scan-assembler "rdsspd|incsspd\[ \t]+(%|)eax" { target ia32 } } } */
 /* { dg-final { scan-assembler "rdssp\[dq]\[ \t]+(%|)\[re]ax"  { target { ! ia32 } } } } */
 /* { dg-final { scan-assembler "incssp\[dq]\[ \t]+(%|)\[re]di" { target { ! ia32 } } } } */