Ensure mjsunit tests use dashes not underscores in flags directives.

test/mjsunit/regress/regress-1119.js

 // Copyright 2011 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 10 matching lines @@
 // SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 // LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 // DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 // THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 
 // Test runtime declaration of properties with var which are intercepted
 // by JS accessors.
 
-// Flags: --es52_globals
+// Flags: --es52-globals
 
 this.__defineSetter__("x", function() { hasBeenInvoked = true; });
 this.__defineSetter__("y", function() { throw 'exception'; });
 
 var hasBeenInvoked = false;
 eval("try { } catch (e) { var x = false; }");
 assertTrue(hasBeenInvoked);
 
 // This has to run in global scope, so cannot use assertThrows...
 try {
   eval("try { } catch (e) { var y = false; }");
   assertUnreachable();
 } catch (e) {
   assertEquals('exception', e);
 }