Convert exception throwing JIT helpers to managed code.

src/coreclr/System.Private.CoreLib/src/System/ThrowHelper.cs

@@ -1,19 +1,9 @@
 // Licensed to the .NET Foundation under one or more agreements.
 // The .NET Foundation licenses this file to you under the MIT license.
 
-using System.Buffers;
-using System.Collections.Generic;
-using System.Diagnostics;
 using System.Diagnostics.CodeAnalysis;
-using System.IO;
-using System.Numerics;
-using System.Reflection;
-using System.Runtime;
 using System.Runtime.CompilerServices;
 using System.Runtime.InteropServices;
-using System.Runtime.Intrinsics;
-using System.Runtime.Serialization;
-using System.Threading;
 
 namespace System
 {

src/coreclr/vm/methodtable.cpp

@@ -5193,7 +5193,13 @@ void ThrowEntryPointNotFoundException(
     MethodTable *pInterfaceMT,
     MethodDesc *pInterfaceMD)
 {
-    LIMITED_METHOD_CONTRACT;
+    CONTRACTL
+    {
+        THROWS;
+        GC_TRIGGERS;
+        MODE_PREEMPTIVE;
+    }
+    CONTRACTL_END;
 
     SString assemblyName;
 
@@ -5400,7 +5406,13 @@ void ThrowAmbiguousResolutionException(
     MethodTable *pInterfaceMT,
     MethodDesc *pInterfaceMD)
 {
-    LIMITED_METHOD_CONTRACT;
+    CONTRACTL
+    {
+        THROWS;
+        GC_TRIGGERS;
+        MODE_PREEMPTIVE;
+    }
+    CONTRACTL_END;
 
     SString assemblyName;