[llvm] [lit] show retry attempts (PR #142413)

[Konrad Kleine via llvm-commits]

kwk wrote:

Hopefully 66ec87e fixed this issue:

```
Traceback (most recent call last):
  File "/usr/lib/python3.10/threading.py", line 1016, in _bootstrap_inner
    self.run()
  File "/usr/lib/python3.10/threading.py", line 953, in run
    self._target(*self._args, **self._kwargs)
  File "/usr/lib/python3.10/multiprocessing/pool.py", line 595, in _handle_results
    cache[job]._set(i, obj)
  File "/usr/lib/python3.10/multiprocessing/pool.py", line 779, in _set
    self._callback(self._value)
  File "/var/lib/buildkite-agent/builds/linux-56-59b8f5d88-v6lwg-1/llvm-project/github-pull-requests/llvm/utils/lit/lit/display.py", line 105, in update
    self.print_result(test)
  File "/var/lib/buildkite-agent/builds/linux-56-59b8f5d88-v6lwg-1/llvm-project/github-pull-requests/llvm/utils/lit/lit/display.py", line 122, in print_result
    if test.result.attempts > 1:
TypeError: '>' not supported between instances of 'NoneType' and 'int'
```

https://github.com/llvm/llvm-project/pull/142413