Imported Upstream version 4.0.0~alpha1

Former-commit-id: 806294f5ded97629b74c85c09952f2a74fe182d9

external/referencesource/mscorlib/system/appdomainattributes.cs

@@ -0,0 +1,55 @@
+// ==++==
+// 
+//   Copyright (c) Microsoft Corporation.  All rights reserved.
+// 
+// ==--==
+/*=============================================================================
+**
+** File: AppDomainAttributes
+** 
+** <OWNER>[....]</OWNER>
+**
+**
+** Purpose: For AppDomain-related custom attributes.
+**
+**
+=============================================================================*/
+
+namespace System {
+
+    [Serializable]
+    [System.Runtime.InteropServices.ComVisible(true)]
+    public enum LoaderOptimization 
+    {
+        NotSpecified            = 0,
+        SingleDomain            = 1,
+        MultiDomain             = 2,
+        MultiDomainHost         = 3,
+#if !FEATURE_CORECLR
+        [Obsolete("This method has been deprecated. Please use Assembly.Load() instead. http://go.microsoft.com/fwlink/?linkid=14202")]
+        DomainMask              = 3,
+
+        [Obsolete("This method has been deprecated. Please use Assembly.Load() instead. http://go.microsoft.com/fwlink/?linkid=14202")]
+        DisallowBindings        = 4           
+#endif        
+    }
+
+    [AttributeUsage (AttributeTargets.Method)]  
+    [System.Runtime.InteropServices.ComVisible(true)]
+    public sealed class LoaderOptimizationAttribute : Attribute
+    {
+        internal byte _val;
+
+        public LoaderOptimizationAttribute(byte value)
+        {
+            _val = value;
+        }
+        public LoaderOptimizationAttribute(LoaderOptimization value)
+        {
+            _val = (byte) value;
+        }
+        public LoaderOptimization Value 
+        {  get {return (LoaderOptimization) _val;} }
+    }
+}
+