Alexandre Ganea 7b25fa8c7a [Support] Attempt to fix deadlock in ThreadGroup ...

This is an attempt to fix the situation described by https://reviews.llvm.org/D104207#2826290 and PR41508.
See sequence of operations leading to the bug in https://reviews.llvm.org/D104207#3004689

We ensure that the Latch is completely "free" before decrementing the number of TaskGroupInstances.

Differential revision: https://reviews.llvm.org/D109914

2021-09-18 13:49:10 -04:00

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