Add missing file

diff --git a/mcs/class/corlib/Test/System/GCTest.cs b/mcs/class/corlib/Test/System/GCTest.cs
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+++ b/mcs/class/corlib/Test/System/GCTest.cs
@@ -0,0 +1,72 @@
+//
+// GCTest.cs - NUnit Test Cases for GC
+//
+// Authors:
+//     Marek Safar  <marek.safar@gmail.com>
+//
+// Copyright (C) 2016 Xamarin Inc (http://www.xamarin.com)
+//
+// Permission is hereby granted, free of charge, to any person obtaining
+// a copy of this software and associated documentation files (the
+// "Software"), to deal in the Software without restriction, including
+// without limitation the rights to use, copy, modify, merge, publish,
+// distribute, sublicense, and/or sell copies of the Software, and to
+// permit persons to whom the Software is furnished to do so, subject to
+// the following conditions:
+//
+// The above copyright notice and this permission notice shall be
+// included in all copies or substantial portions of the Software.
+//
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
+// LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
+// OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
+// WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+//
+
+using System;
+using System.Threading.Tasks;
+
+using NUnit.Framework;
+
+namespace MonoTests.System {
+
+       [TestFixture]
+       public class GCTest {
+
+               class MyFinalizeObject
+               {
+                       public volatile static int finalized;
+
+                       ~MyFinalizeObject ()
+                       {
+                               if (finalized++ == 0) {
+                                       GC.ReRegisterForFinalize (this);
+                               }
+                       }
+               }
+
+               static void Run_ReRegisterForFinalizeTest ()
+               {
+                       var m = new WeakReference<MyFinalizeObject> (new MyFinalizeObject ());
+                       m.SetTarget (null);
+               }
+
+               [Test]
+               public void ReRegisterForFinalizeTest ()
+               {
+                       Run_ReRegisterForFinalizeTest ();
+                       var t = Task.Factory.StartNew (() => {
+                               do {
+                                       GC.Collect ();
+                                       GC.WaitForPendingFinalizers ();
+                                       Task.Yield ();
+                               } while (MyFinalizeObject.finalized != 2);
+                       });
+
+                       Assert.IsTrue (t.Wait (5000));
+               }
+       }
+}
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