[issue40941] Merge generator.gi_running and frame executing flag into single frame state

[Mark Shannon]

Change by Mark Shannon <mark at hotpy.org>:


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keywords: +patch
pull_requests: +19999
stage: needs patch -> patch review
pull_request: https://github.com/python/cpython/pull/20803

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue40941>
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