block_of_code: Support stack unwinding on Windows

src/backend_x64/unwind_generic.cpp

@@ -0,0 +1,23 @@
+/* This file is part of the dynarmic project.
+ * Copyright (c) 2016 MerryMage
+ * This software may be used and distributed according to the terms of the GNU
+ * General Public License version 2 or any later version.
+ */
+
+#include "backend_x64/block_of_code.h"
+
+namespace Dynarmic {
+namespace BackendX64 {
+
+struct BlockOfCode::UnwindHandler::Impl final {
+};
+
+BlockOfCode::UnwindHandler::UnwindHandler() = default;
+BlockOfCode::UnwindHandler::~UnwindHandler() = default;
+
+void BlockOfCode::UnwindHandler::Register(BlockOfCode*) {
+    // Do nothing
+}
+
+} // namespace BackendX64
+} // namespace Dynarmic