Fix test after r18586

test/mjsunit/regress/regress-map-invalidation-1.js

 // Copyright 2013 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 12 matching lines @@
 // 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.
 
 // Flags: --allow-natives-syntax
 
 var c = { x: 2, y: 1 };
 
 function h() {
-  %MigrateInstance(c);
+  %TryMigrateInstance(c);
   return 2;
 }
 %NeverOptimizeFunction(h);
 
 function f() {
   for (var i = 0; i < 100000; i++) {
     var n = c.x + h();
     assertEquals(4, n);
   }
   var o2 = [{ x: 2.5, y:1 }];
   return o2;
 }
 
 f();