[llvm] [CMake] Fix DynamicLibraryTests exports symbol when plugins are enabled (PR #102941)

[Steven Wu via llvm-commits]

cachemeifyoucan wrote:

Ah, actually previous try at: https://github.com/llvm/llvm-project/pull/102671 actually works and the failure was due to: https://github.com/llvm/llvm-project/issues/102858

ASAN made the other tests failed by pushing some symbols out of range. Now it is marked as unsupported on ASAN, let me get back the old fix.

https://github.com/llvm/llvm-project/pull/102941