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/GenericInterruptHandler.h

@@ -44,7 +44,7 @@ class GenericInterruptHandler {
 public:
     static GenericInterruptHandler& from(u8 interrupt_number);
     virtual ~GenericInterruptHandler();
-    virtual void handle_interrupt(RegisterState& regs) = 0;
+    virtual void handle_interrupt(const RegisterState& regs) = 0;
 
     u8 interrupt_number() const { return m_interrupt_number; }