[llvm] [llvm][lit] Add option to run only the failed tests (PR #158043)

[James Henderson via llvm-commits]

jh7370 wrote:

> @jh7370 do you have any idea what could be going on here? Do you see anything wrong here that would cause the tests not to work on Windows. For some reason in `filter-failed.py` and `filter-failed-rerun.py` the `UNRESOLVED` tests don't seem to get marked as failures, so they don't get picked up by `filter-failed`. But it does work for `filter-failed-delete.py`. Which confuses me, since they use the same test inputs.

I don't know why CI isn't showing it up as failing, but filter-failed-delete.py fails for me, as well as the other two.

https://github.com/llvm/llvm-project/pull/158043