[llvm] [lit] Fix lit hang on pool join when exception is thrown (PR #131881)

[James Henderson via llvm-commits]

jh7370 wrote:

> Hello @jh7370, wanted to get the ball rolling on the review for this fix. Figured you might be the right person to bug since I saw you review a couple of other lit related PRs. Thanks :)

Sorry, I'm a bit snowed-under with reviews and my regular non-LLVM work at the moment, having just come back from a bit of time off. I'll add this to my queue, but it may be a while before I have a chance to look at this).

https://github.com/llvm/llvm-project/pull/131881