Becuase of cross-context calls, hydrogen-based Array constructor needs to ensure

test/mjsunit/allocation-site-info.js

 // Copyright 2012 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 23 matching lines @@
 
 // Test element kind of objects.
 // Since --smi-only-arrays affects builtins, its default setting at compile
 // time sticks if built with snapshot.  If --smi-only-arrays is deactivated
 // by default, only a no-snapshot build actually has smi-only arrays enabled
 // in this test case.  Depending on whether smi-only arrays are actually
 // enabled, this test takes the appropriate code path to check smi-only arrays.
 
 // support_smi_only_arrays = %HasFastSmiElements(new Array(1,2,3,4,5,6,7,8));
 support_smi_only_arrays = true;
-optimize_constructed_arrays = false;
+optimize_constructed_arrays = true;
 
 if (support_smi_only_arrays) {
   print("Tests include smi-only arrays.");
 } else {
   print("Tests do NOT include smi-only arrays.");
 }
 
 if (optimize_constructed_arrays) {
   print("Tests include constructed array optimizations.");
 } else {
@@ skipping 222 matching lines @@
       a[0] = value;
       return a;
     }
 
     obj = newarraycase_list_smiobj(1);
     assertKind(elements_kind.fast_smi_only, obj);
     obj = newarraycase_list_smiobj("coates");
     assertKind(elements_kind.fast, obj);
     obj = newarraycase_list_smiobj(2);
     assertKind(elements_kind.fast, obj);
+
+    // Verify that cross context calls work
+    var realmA = Realm.current();
+    var realmB = Realm.create();
+    assertEquals(0, realmA);
+    assertEquals(1, realmB);
+
+    function instanceof_check(type) {
+      assertTrue(new type() instanceof type);
+      assertTrue(new type(5) instanceof type);
+      assertTrue(new type(1,2,3) instanceof type);
+    }
+
+    var realmBArray = Realm.eval(realmB, "Array");
+    instanceof_check(Array);
+    instanceof_check(realmBArray);
+    %OptimizeFunctionOnNextCall(instanceof_check);
+    instanceof_check(Array);
+    instanceof_check(realmBArray);
+    assertTrue(2 != %GetOptimizationStatus(instanceof_check));
   }
 }