Initialize internal arrays with the correct map.

test/mjsunit/regress/regress-1878.js

-// Copyright 2009 the V8 project authors. All rights reserved.
+// 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
 //       with the distribution.
@@ skipping 11 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.
 
 // See: http://code.google.com/p/v8/issues/detail?id=1878
 
 // Flags: --allow-natives-syntax --expose_natives_as=natives
 
 var a = Array();
-var ai = natives.InternalArray();
-assertFalse(%HaveSameMap(ai, a));
+
+for (var i = 0; i < 1000; i++) {
+  var ai = natives.InternalArray(10000);
+  assertFalse(%HaveSameMap(ai, a));
+  assertTrue(%HasFastElements(ai));
+}
+
+for (var i = 0; i < 1000; i++) {
+  var ai = new natives.InternalArray(10000);
+  assertFalse(%HaveSameMap(ai, a));
+  assertTrue(%HasFastElements(ai));
+}