[issue28665] Harmonize STORE_DEREF with STORE_FAST and LOAD_DEREF

[Roundup Robot]

Roundup Robot added the comment:

New changeset 7ec45e7d2194 by Serhiy Storchaka in branch 'default':
Merge from 3.6 (issue #28665).
https://hg.python.org/cpython/rev/7ec45e7d2194

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<http://bugs.python.org/issue28665>
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