Kernel: Use a const reference to RegisterState in IRQ handling

Author: https://github.com/supercomputer7
Commit: e880fe0765
Pull-request: https://github.com/SerenityOS/serenity/pull/1396
Reviewed-by: https://github.com/awesomekling
Reviewed-by: https://github.com/shannonbooth ✅

Kernel/Interrupts/SpuriousInterruptHandler.h

@@ -39,7 +39,7 @@ class SpuriousInterruptHandler final : public GenericInterruptHandler {
 public:
     static void initialize(u8 interrupt_number);
     virtual ~SpuriousInterruptHandler();
-    virtual void handle_interrupt(RegisterState& regs) override;
+    virtual void handle_interrupt(const RegisterState& regs) override;
 
     void register_handler(GenericInterruptHandler&);
     void unregister_handler(GenericInterruptHandler&);