[llvm] [TSan] Fix missing inst cleanup (PR #144067)

[Kunqiu Chen via llvm-commits]

Camsyn wrote:

> Can you please rebase over [4f8187c](https://github.com/llvm/llvm-project/commit/4f8187c0dc6e7a818ebf3272a0c022203f901e96) and regenerate the test, so we can see the difference?

Done. It just removes some useless `load atomic`s, which should have been replaced by `call __tsan_atomic*_load`

https://github.com/llvm/llvm-project/pull/144067