[issue28959] Add a macro for dict size

[Serhiy Storchaka]

Serhiy Storchaka added the comment:

Following patch also switches the struct of a dict to PyObject_VAR_HEAD.

Should we use Py_SIZE or _PyDict_GET_SIZE? It is easier to replace _PyDict_GET_SIZE with Py_SIZE than restore dict-specific name from some of Py_SIZE-s.

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Added file: http://bugs.python.org/file45877/_PyDict_GET_SIZE-2.patch

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