[lld] [lld] check cache in loadDylib before real_path (PR #143595)

[Daniel Rodríguez Troitiño via llvm-commits]

https://github.com/drodriguez approved this pull request.

@zmodem I am not sure if you have been able to test this in your internal systems. I understand this was complicated to reproduce, but if it is even more difficult to reproduce now, it might mean it is removed completely. Obviously landing and waiting for your internal systems to catch up is also a possibility.

https://github.com/llvm/llvm-project/pull/143595