Add integration tests for `MonoAOTLLVMToolchain`

描述

贡献者指南

技术栈

csharp

领域

testing

议题类型

test

难度面向新贡献者的预计实现难度，1 表示很小改动，5 表示专家级工作。

3

预计时间有经验贡献者完成调查、实现、测试并准备 pull request 的粗略时间范围。

1-3 hours

活动状态议题当前的可参与程度：新鲜、活跃、陈旧、阻塞或等待维护者输入。

fresh

清晰度议题是否清楚说明期望改动、验收标准和下一步。

mostly clear

前置要求

familiarity with BenchmarkDotNet testingbasic knowledge of MonoAOTLLVMToolchain

新手友好度1-100 的估计分数，表示该议题对首次贡献者的友好程度。

60

研究方向

First, review existing integration tests in the repository, such as those for other toolchains like MonoAOTCppToolchain. Examine the class MonoAOTLLVMToolchain in the source code to understand its methods and expected behavior. Refer to issue #2533 for context on what needs to work and fail properly. Then, create test cases that verify successful execution and failure scenarios, following the pattern of existing test files.