ArmInterface: Delegate Exclusive monitor factory to exclusive monitor interfasce.

src/core/arm/exclusive_monitor.cpp

@@ -2,10 +2,23 @@
 // Licensed under GPLv2 or any later version
 // Refer to the license.txt file included.
 
+#ifdef ARCHITECTURE_x86_64
+#include "core/arm/dynarmic/arm_dynarmic.h"
+#endif
 #include "core/arm/exclusive_monitor.h"
+#include "core/memory.h"
 
 namespace Core {
 
 ExclusiveMonitor::~ExclusiveMonitor() = default;
 
+std::unique_ptr<Core::ExclusiveMonitor> MakeExclusiveMonitor(Memory::Memory& memory, std::size_t num_cores) {
+#ifdef ARCHITECTURE_x86_64
+    return std::make_unique<Core::DynarmicExclusiveMonitor>(memory, num_cores);
+#else
+    // TODO(merry): Passthrough exclusive monitor
+    return nullptr;
+#endif
+}
+
 } // namespace Core