[llvm] [lit] Prevent "lld" from being substituted by LIT in llvm-driver tests (PR #191893)

[Aiden Grossman via llvm-commits]

https://github.com/boomanaiden154 approved this pull request.

I guess this is probably the best way to solve this problem.

It would be nice to understand why the patch in question actually caused this regression.

https://github.com/llvm/llvm-project/pull/191893