Revert "Add workaround for dotnet/runtime#90800"

This reverts commit 959cef6.

src/ObjCRuntime/RegistrarHelper.cs

@@ -194,12 +194,6 @@ static IntPtr LookupUnmanagedFunctionInAssembly (IntPtr assembly_name, string? s
 			return entry.Registrar.LookupUnmanagedFunction (symbol, id);
 		}
 
-		[MethodImpl(MethodImplOptions.NoInlining)]
-		internal static bool RuntimeTypeHandleEquals (ref RuntimeTypeHandle typeHandle, RuntimeTypeHandle otherTypeHandle)
-		{
-			return typeHandle.Equals (otherTypeHandle);
-		}
-
 		internal static Type LookupRegisteredType (Assembly assembly, uint id)
 		{
 			var entry = GetMapEntry (assembly);

tools/dotnet-linker/AppBundleRewriter.cs

@@ -500,13 +500,9 @@ public MethodReference DynamicDependencyAttribute_ctor__DynamicallyAccessedMembe
 
 		public MethodReference RuntimeTypeHandle_Equals {
 			get {
-				if (configuration.Application.XamarinRuntime == XamarinRuntime.MonoVM) {
-					return RegistrarHelper_RuntimeTypeHandleEquals;
-				}
 				return GetMethodReference (CorlibAssembly, System_RuntimeTypeHandle, "Equals", isStatic: false, System_RuntimeTypeHandle);
 			}
 		}
-
 		public MethodReference MethodBase_Invoke {
 			get {
 				return GetMethodReference (CorlibAssembly, System_Reflection_MethodBase, "Invoke", (v) =>
@@ -757,20 +753,6 @@ public MethodReference RegistrarHelper_Register {
 			}
 		}
 
-		public MethodReference RegistrarHelper_RuntimeTypeHandleEquals {
-			get {
-				return GetMethodReference (PlatformAssembly,
-						ObjCRuntime_RegistrarHelper,
-						"RuntimeTypeHandleEquals",
-						(v) => v.IsStatic
-						&& v.HasParameters
-						&& v.Parameters.Count == 2
-						&& v.Parameters [0].ParameterType is ByReferenceType brt1 && brt1.ElementType.Is ("System", "RuntimeTypeHandle")
-						&& v.Parameters [1].ParameterType.Is ("System", "RuntimeTypeHandle")
-						&& !v.HasGenericParameters);
-			}
-		}
-
 		public MethodReference IManagedRegistrar_LookupUnmanagedFunction {
 			get {
 				return GetMethodReference (PlatformAssembly,