[issue41617] __builtin_bswap16 is used without checking it is supported

[STINNER Victor]

STINNER Victor <vstinner at python.org> added the comment:


New changeset e6905e4c82cc05897dc1bf5ab2b5b94b2b043a7f by Victor Stinner in branch 'master':
bpo-41617: Fix pycore_bitutils.h to support clang 3.0 (GH-22042)
https://github.com/python/cpython/commit/e6905e4c82cc05897dc1bf5ab2b5b94b2b043a7f


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<https://bugs.python.org/issue41617>
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