Lay down initial JIT structure

src/backend/core/BaseCPU.hpp

@@ -6,7 +6,12 @@ namespace n64 {
 struct BaseCPU {
   virtual ~BaseCPU() = default;
   virtual int Step() {return 0;}
-  virtual void Reset() {}
+  virtual void Reset() {
+    regs.Reset();
+    mem.Reset();
+  }
+  virtual bool ShouldServiceInterrupt() {return false;}
+  virtual void CheckCompareInterrupt() {}
   Registers regs;
   Mem mem;
 };