[3.8] bpo-41247: asyncio.set_running_loop() cache running loop holder (GH-21401) #21403
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The running loop holder cache variable was always set to NULL when
calling set_running_loop.
Now set_running_loop saves the newly created running loop holder in the
cache variable for faster access in get_running_loop.
Automerge-Triggered-By: @1st1
(cherry picked from commit 529f426)
Co-authored-by: Tony Solomonik [email protected]
https://bugs.python.org/issue41247
Automerge-Triggered-By: @1st1