[issue41617] __builtin_bswap16 is used without checking it is supported

[Joshua Root]

Change by Joshua Root <josh+python at root.id.au>:


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pull_requests: +21053
pull_request: https://github.com/python/cpython/pull/21943

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue41617>
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