[issue29369] Use Py_IDENTIFIER in Python-ast.c

[Serhiy Storchaka]

Serhiy Storchaka added the comment:

LGTM. _Py_IDENTIFIER is private API, but is not new in Python-ast.c.

I expect insignificant speedup and reduce the memory usage from the patch.

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nosy: +serhiy.storchaka

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<http://bugs.python.org/issue29369>
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