Preliminary mid-asm hook for gracefully exiting the game

UnleashedRecomp/game.cpp

@@ -0,0 +1,12 @@
+#include "game.h"
+
+void Game::Exit()
+{
+    s_isSignalExit = true;
+}
+
+bool GracefulLoopExitMidAsmHook()
+{
+    // TODO (Sajid): investigate XAM handle closing causing assertion failure here.
+    return Game::s_isSignalExit;
+}