Bugfix: fix multi-threading issue

[catsalty]

• change ReLinkerInstance#loadedLibraries to CopyOnWriteArraySet

[benjamin-bader]

Thanks for the PR! It's hard to understand what problem this solves; can you expand on that, and on why COW is the right solution?

[catsalty]

Thanks for the PR! It's hard to understand what problem this solves; can you expand on that, and on why COW is the right solution?

When ReLinkerInstance#loadLibraryInternal() is executed in multiple threads, loadedLibraries determines whether the loaded library is unreliable. Here, a thread-safe set collection can be used to avoid this problem.

[jianglei12138]

Any update? same exception when load so in multi thread.