Reland "[lit] Synthesize artificial deadline"
We always want to use a deadline when calling `result.await`. Let's
synthesize an artificial deadline (now plus one year) to simplify code
and do less busy waiting.
Thanks to Reid Kleckner for diagnosing that a deadline for of "positive
infinity" does not work with Python 3 anymore. See commit:
I tested this patch with Python 2 and Python 3.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@375165 91177308-0d34-0410-b5e6-96231b3b80d8
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