[issue39689] struct and memoryview tests rely on undefined behavior (as revealed by clang 9)

[Stefan Krah]

Change by Stefan Krah <stefan at bytereef.org>:


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pull_requests: +18312
pull_request: https://github.com/python/cpython/pull/18964

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue39689>
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