[issue19617] Fix usage of Py_ssize_t type in Python/compile.c

[STINNER Victor]

STINNER Victor added the comment:

> You could use the Py_SAFE_DOWNCAST macro everywhere.

I prefer to store sizes in a size type (Py_ssize_t), and only downcast where it is really needed, in compiler_addop_i(). So in the future, if someone wants to support values larger than INT_MAX, only one function need to be changed.

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<http://bugs.python.org/issue19617>
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