[testsuite] Require label_values in builtin-unreachable-6.c

2018-03-16  Tom de Vries  <tom@codesourcery.com>

	* gcc.dg/builtin-unreachable-6.c: Require effective target label_values.

From-SVN: r258589

gcc/testsuite/ChangeLog

+2018-03-16  Tom de Vries  <tom@codesourcery.com>
+
+	* gcc.dg/builtin-unreachable-6.c: Require effective target label_values.
+
 2018-03-16  Jakub Jelinek  <jakub@redhat.com>
 
 	PR c++/84874

gcc/testsuite/gcc.dg/builtin-unreachable-6.c

 /* { dg-do compile } */
 /* { dg-options "-O2 -fdump-tree-fab1 -fno-tree-dominator-opts -fno-tree-vrp" } */
+/* { dg-require-effective-target label_values } */
 
 void
 foo (int b, int c)