[issue27358] BUILD_MAP_UNPACK_WITH_CALL is slow

[Demur Rumed]

Changes by Demur Rumed <gunkmute at gmail.com>:


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components: +Interpreter Core
type:  -> performance
versions: +Python 3.6

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue27358>
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