[issue29383] Reduce temporary unicode object while adding descriptors

[INADA Naoki]

INADA Naoki added the comment:

descr-remove-getitemstring-2.patch is more compact than first patch.
(3 unicode + 2 intern) becomes (2 unicode + 1 intern).

python_startup_no_site: Median +- std dev: 12.5 ms +- 0.1 ms

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Added file: http://bugs.python.org/file46443/descr-remove-getitemstring-2.patch

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<http://bugs.python.org/issue29383>
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