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

[Michael Buch via llvm-commits]

Michael137 wrote:

Oh probably because I'm echoing the file incorrectly on Windos:
```
echo "RUN: false" > C:\_work\llvm-project\llvm-project\build\utils\lit\tests\Output\filter-failed.py.tmp/new-fail.txt
```

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