[llvm] [BOLT] Fix unit test failures when libLLVM is linked dynamically (PR #152190)

[Anatoly Trosinenko via llvm-commits]

atrosinenko wrote:

> I believe this matches your findings; can you confirm?

Yes, I tried rebuilding LLVM from scratch at cd0268063d47fb7e5331300db7c21d7302531e33 with `LLVM_ENABLE_ASSERTIONS=OFF` and `check-bolt` tests passed, then I rebuilt it with `LLVM_ENABLE_ASSERTIONS=ON` and got two test failures (`Core/./CoreTests/failed_to_discover_tests_from_gtest` and similar for `Profile`) again.

https://github.com/llvm/llvm-project/pull/152190