Imported Upstream version 6.4.0.137

Former-commit-id: 943baa9f16a098c33e129777827f3a9d20da00d6

mcs/class/corlib/corert/CancellationTokenRegistration.cs

@@ -0,0 +1,18 @@
+// Licensed to the .NET Foundation under one or more agreements.
+// The .NET Foundation licenses this file to you under the MIT license.
+// See the LICENSE file in the project root for more information.
+
+using System.Threading.Tasks;
+using System.Runtime.CompilerServices;
+
+namespace System.Threading
+{
+    partial struct CancellationTokenRegistration : IAsyncDisposable
+    {
+        public ValueTask DisposeAsync()
+        {
+            Dispose();
+            return new ValueTask(Task.FromResult<object>(null));
+        }
+    }
+}

mcs/class/corlib/corert/Decimal.DecCalc.cs.REMOVED.git-id

@@ -1 +1 @@
-d401155ef021a7c184607b19fe3c53d7ab9bccfe
+a7f0f55f625a7889d8557e32c91785d16411b635

mcs/class/corlib/corert/Decimal.cs.REMOVED.git-id

@@ -1 +1 @@
-185ecfe95a4f99dcc1009272f8eda1cb0952ea95
+3e35f8c7be8297c4e887ece490627e9a61872c18