Fix cluster-fuzz regression when getting message from Worker

test/mjsunit/d8-worker-spawn-worker.js

-// Copyright 2013 the V8 project authors. All rights reserved.
+// Copyright 2015 the V8 project authors. All rights reserved.
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 // modification, are permitted provided that the following conditions are
 // met:
 //
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 //       notice, this list of conditions and the following disclaimer.
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 //       from this software without specific prior written permission.
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 // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 
-// Flags: --use-osr
+if (this.Worker) {
+  function f() {
+    var g = function () {
+      postMessage(42);
+    };
 
-function f() {
-  var sum = 0;
-  for (var i = 0; i < 10; i++) {
-    for (var j = 0; j < 100000; j++) {
-      var x = i + 2;
-      var y = x + 5;
-      var z = y + 3;
-      sum += z;
-    }
+    var w = new Worker(g);
+
+    onmessage = function(parentMsg) {
+      w.postMessage(parentMsg);
+      var childMsg = w.getMessage();
+      postMessage(childMsg);
+    };
   }
-  return sum;
+
+  var w = new Worker(f);
+  w.postMessage(9);
+  assertEquals(42, w.getMessage());
 }
-
-
-assertEquals(14500000, f());
-assertEquals(14500000, f());
-assertEquals(14500000, f());