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

[David Garcia Orozco via llvm-commits]

ayylol wrote:

Hey @jh7370, was wondering if you would have free cycles to take a look at this soon. If not do you know of anyone else that may be appropriate to review this PR? Thanks.

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