rsx: Import robin-hood unordered map which is much faster than std

rpcs3/Emu/RSX/Common/unordered_map.hpp

@@ -0,0 +1,19 @@
+#pragma once
+
+#ifdef RSX_USE_STD_MAP
+#include <unordered_map>
+
+namespace rsx
+{
+	template<typename T, typename U>
+	using unordered_map = std::unordered_map<T, U>;
+}
+#else
+#include "3rdparty/robin_hood/include/robin_hood.h"
+
+namespace rsx
+{
+	template<typename T, typename U>
+	using unordered_map = ::robin_hood::unordered_map<T, U>;
+}
+#endif