[llvm] [llvm-lit] Fix `TypeError` string argument expected in lit's internal shell (PR #105925)

[via llvm-commits]

Harini0924 wrote:

@arichardson  I’ve updated the commit message as suggested and changed the lit test from `UNRESOLVED` to `PASS`. Let me know if there are any other changes you'd like me to make.

https://github.com/llvm/llvm-project/pull/105925