Require CET target on gcc.target/i386/pr85404.c

Need a working CET assembler to assemble the compiler output.

	* gcc.target/i386/pr85404.c: Require CET target.

From-SVN: r259508

gcc/testsuite/ChangeLog

+2018-04-19  H.J. Lu  <hongjiu.lu@intel.com>
+
+	* gcc.target/i386/pr85404.c: Require CET target.
+
 2018-04-19  Jakub Jelinek  <jakub@redhat.com>
 
 	PR tree-optimization/85467

gcc/testsuite/gcc.target/i386/pr85404.c

-/* { dg-do assemble } */
+/* { dg-do assemble { target cet } } */
 /* { dg-options "-fleading-underscore -mcet -fcf-protection" } */
 
 void func(void) __asm("_func");