Core: Port Exclusive memory impl from yuzu

core\arm\dynarmic\arm_dynarmic.cpp: fix build

core\arm\dynarmic\arm_dynarmic.cpp: Fixes

CPP 20

src/core/core.h

@@ -61,6 +61,7 @@ class RendererBase;
 
 namespace Core {
 
+class ExclusiveMonitor;
 class Timing;
 
 class System {
@@ -363,6 +364,8 @@ private:
     std::unique_ptr<Kernel::KernelSystem> kernel;
     std::unique_ptr<Timing> timing;
 
+     std::unique_ptr<Core::ExclusiveMonitor> exclusive_monitor;
+
 private:
     static System s_instance;