Add stub for PluginProcessNetBSD

Summary:
This is the base for introduction of further features to support Process Tracing on NetBSD, in local and remote setup.

This code is also a starting point to synchronize the development with other BSDs. Currently NetBSD is ahead and other systems can catch up.

Sponsored by <The NetBSD Foundation>

Reviewers: emaste, joerg, kettenis, labath

Reviewed By: labath

Subscribers: mgorny, #lldb

Tags: #lldb

Differential Revision: https://reviews.llvm.org/D31138

llvm-svn: 298408
diff --git a/lldb/source/Plugins/Process/NetBSD/NativeThreadNetBSD.cpp b/lldb/source/Plugins/Process/NetBSD/NativeThreadNetBSD.cpp
new file mode 100644
index 0000000..1646337
--- /dev/null
+++ b/lldb/source/Plugins/Process/NetBSD/NativeThreadNetBSD.cpp
@@ -0,0 +1,21 @@
+//===-- NativeThreadNetBSD.cpp -------------------------------- -*- C++ -*-===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+#include "NativeThreadNetBSD.h"
+#include "NativeRegisterContextNetBSD.h"
+
+#include "NativeProcessNetBSD.h"
+
+using namespace lldb;
+using namespace lldb_private;
+using namespace lldb_private::process_netbsd;
+
+NativeThreadNetBSD::NativeThreadNetBSD(NativeProcessNetBSD *process,
+                                       lldb::tid_t tid)
+    : NativeThreadProtocol(process, tid) {}