Add project files.

Compat.Private.Serialization/Compat/Fx.cs

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+using System;
+using System.Diagnostics;
+
+namespace Compat
+{
+    internal class Fx
+    {
+        public static void Assert(string message)
+        {
+            Debug.Assert(false, message);
+        }
+
+        public static void Assert(bool condition, string message)
+        {
+            Debug.Assert(condition, message);
+        }
+
+        public static bool IsFatal(Exception ex)
+        {
+            ex = Unwrap(ex);
+
+            return ex is NullReferenceException ||
+                   ex is StackOverflowException ||
+                   ex is OutOfMemoryException ||
+                   ex is System.Threading.ThreadAbortException ||
+                   ex is System.Runtime.InteropServices.SEHException ||
+                   ex is System.Security.SecurityException;
+        }
+
+        internal static Exception Unwrap(Exception ex)
+        {
+            // for certain types of exceptions, we care more about the inner
+            // exception
+            while (ex.InnerException != null &&
+                    (ex is System.Reflection.TargetInvocationException))
+            {
+                ex = ex.InnerException;
+            }
+
+            return ex;
+        }
+    }
+}