Kernel/IPC: Added a function to translate the IPC command buffer from one process to another.

Currently only CopyHandle, MoveHandle and CallingPid descriptors are implemented.

src/core/hle/kernel/ipc.h

@@ -0,0 +1,14 @@
+// Copyright 2017 Citra Emulator Project
+// Licensed under GPLv2 or any later version
+// Refer to the license.txt file included.
+
+#pragma once
+
+#include "common/common_types.h"
+#include "core/hle/kernel/thread.h"
+
+namespace Kernel {
+/// Performs IPC command buffer translation from one process to another.
+ResultCode TranslateCommandBuffer(SharedPtr<Thread> src_thread, SharedPtr<Thread> dst_thread,
+                                  VAddr src_address, VAddr dst_address);
+} // namespace Kernel