LibJS/Bytecode: Get result from accumulator in PerformEval

This is how the JS REPL retrieves the result of executing bytecode.

Userland/Libraries/LibJS/Runtime/AbstractOperations.cpp

@@ -703,10 +703,13 @@ ThrowCompletionOr<Value> perform_eval(GlobalObject& global_object, Value x, Call
         executable->name = "eval"sv;
         if (Bytecode::g_dump_bytecode)
             executable->dump();
-        eval_result = TRY(bytecode_interpreter->run(*executable));
-        // Turn potentially empty JS::Value from the bytecode interpreter into an empty Optional
-        if (eval_result.has_value() && eval_result->is_empty())
-            eval_result = {};
+        auto result_or_error = bytecode_interpreter->run_and_return_frame(*executable, nullptr);
+        if (result_or_error.value.is_error())
+            return result_or_error.value.release_error();
+
+        auto& result = result_or_error.frame->registers[0];
+        if (!result.is_empty())
+            eval_result = result;
     } else {
         auto& ast_interpreter = vm.interpreter();
         eval_result = TRY(program->execute(ast_interpreter, global_object));