SingleCore: Improve Cycle timing Behavior and replace mutex in global scheduler for spinlock.

src/core/hle/kernel/scheduler.h

@@ -188,7 +188,7 @@ private:
 
     /// Scheduler lock mechanisms.
     bool is_locked{};
-    std::mutex inner_lock{}; // TODO(Blinkhawk): Replace for a SpinLock
+    Common::SpinLock inner_lock{};
     std::atomic<s64> scope_lock{};
     Core::EmuThreadHandle current_owner{Core::EmuThreadHandle::InvalidHandle()};