common: Add atomic

Implement atomic or operation on u32

src/dynarmic/common/atomic.h

@@ -0,0 +1,20 @@
+/* This file is part of the dynarmic project.
+ * Copyright (c) 2022 MerryMage
+ * SPDX-License-Identifier: 0BSD
+ */
+
+#pragma once
+
+#include "dynarmic/common/common_types.h"
+
+namespace Dynarmic::Atomic {
+
+inline void Or(volatile u32* ptr, u32 value) {
+#ifdef _MSC_VER
+    _InterlockedOr(reinterpret_cast<volatile long*>(ptr), value);
+#else
+    __atomic_or_fetch(ptr, value, __ATOMIC_SEQ_CST);
+#endif
+}
+
+}  // namespace Dynarmic::Atomic