LibJS/JIT: Compile the BlockDeclarationInstantiation instruction

Author: https://github.com/skyrising
Commit: 09dce5f1bd
Pull-request: https://github.com/SerenityOS/serenity/pull/21677

Userland/Libraries/LibJS/Bytecode/Op.h

@@ -1047,6 +1047,8 @@ public:
     ThrowCompletionOr<void> execute_impl(Bytecode::Interpreter&) const;
     DeprecatedString to_deprecated_string_impl(Bytecode::Executable const&) const;
 
+    ScopeNode const& scope_node() const { return m_scope_node; }
+
 private:
     ScopeNode const& m_scope_node;
 };