LibJS/JIT: Compile the SetVariable bytecode instruction

Author: https://github.com/awesomekling
Commit: 6a16783c66
Pull-request: https://github.com/SerenityOS/serenity/pull/21619
Reviewed-by: https://github.com/Hendiadyoin1

Userland/Libraries/LibJS/JIT/Compiler.h

@@ -70,6 +70,7 @@ private:
 
     void compile_call(Bytecode::Op::Call const&);
     void compile_typeof_variable(Bytecode::Op::TypeofVariable const&);
+    void compile_set_variable(Bytecode::Op::SetVariable const&);
 
     void store_vm_register(Bytecode::Register, Assembler::Reg);
     void load_vm_register(Assembler::Reg, Bytecode::Register);