[runtime] Avoid an assert if a runtime compiled without DISABLE_COM is used...

[runtime] Avoid an assert if a runtime compiled without DISABLE_COM is used with an mscorlib from the mobile_static profile.

mono/metadata/cominterop.c

@@ -170,6 +170,22 @@ mono_marshal_safearray_set_value (gpointer safearray, gpointer indices, gpointer
 static void
 mono_marshal_safearray_free_indices (gpointer indices);
 
+MonoClass*
+mono_class_try_get_com_object_class (void)
+{
+	static MonoClass *tmp_class;
+	static gboolean inited;
+	MonoClass *klass;
+	if (!inited) {
+		klass = mono_class_from_name (mono_defaults.corlib, "System", "__ComObject");
+		mono_memory_barrier ();
+		tmp_class = klass;
+		mono_memory_barrier ();
+		inited = TRUE;
+	}
+	return tmp_class;
+}
+
 /**
  * cominterop_method_signature:
  * @method: a method

mono/metadata/cominterop.h

@@ -53,4 +53,7 @@ mono_string_from_bstr (gpointer bstr);
 MONO_API void 
 mono_free_bstr (gpointer bstr);
 
+MonoClass*
+mono_class_try_get_com_object_class (void);
+
 #endif /* __MONO_COMINTEROP_H__ */

mono/metadata/remoting.c

@@ -408,7 +408,7 @@ mono_marshal_get_remoting_invoke (MonoMethod *method)
 
 	/* this seems to be the best plase to put this, as all remoting invokes seem to get filtered through here */
 #ifndef DISABLE_COM
-	if (mono_class_is_com_object (method->klass) || method->klass == mono_class_get_com_object_class ()) {
+	if (mono_class_is_com_object (method->klass) || method->klass == mono_class_try_get_com_object_class ()) {
 		MonoVTable *vtable = mono_class_vtable (mono_domain_get (), method->klass);
 		g_assert (vtable); /*FIXME do proper error handling*/