LibJS: Implement bytecode generation for UpdateExpression :^)

Added Increment and Decrement bytecode ops to support this. Postfix
updates use a temporary register to preserve the original value.

Note that this patch only implements Identifier updates. Member
expression updates are a TODO.

Userland/Libraries/LibJS/AST.h

@@ -937,6 +937,7 @@ public:
 
     virtual Value execute(Interpreter&, GlobalObject&) const override;
     virtual void dump(int indent) const override;
+    virtual void generate_bytecode(Bytecode::Generator&) const override;
 
 private:
     UpdateOp m_op;