[issue29358] Add tp_fastnew and tp_fastinit to PyTypeObject, 15-20% faster object instanciation

[Roundup Robot]

Roundup Robot added the comment:

New changeset 8feb6a5ce4c6 by Victor Stinner in branch 'default':
Issue #29358: Add postcondition checks on types
https://hg.python.org/cpython/rev/8feb6a5ce4c6

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nosy: +python-dev

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<http://bugs.python.org/issue29358>
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