[issue35975] Put back the ability to parse files where async/await aren't keywords

[Guido van Rossum]

Change by Guido van Rossum <guido at python.org>:


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pull_requests: +20193
pull_request: https://github.com/python/cpython/pull/21021

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue35975>
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