Put new global var semantics behind a flag until WebKit tests are cleaned up.

test/mjsunit/regress/regress-1170.js

Index: test/mjsunit/regress/regress-1170.js
diff --git a/test/mjsunit/regress/regress-1170.js b/test/mjsunit/regress/regress-1170.js
index eb3f3c71b72eb090ff2742026940d6c79df74de4..8c5f6f8ab4b309d82776a8e4763b987991cf78ea 100644
--- a/test/mjsunit/regress/regress-1170.js
+++ b/test/mjsunit/regress/regress-1170.js
@@ -25,6 +25,8 @@
 // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 
+// Flags: --es52_globals
+
 var setter_value = 0;
 
 this.__defineSetter__("a", function(v) { setter_value = v; });