[issue27725] Use Py_SIZE(x) instead of x->ob_size

[Raymond Hettinger]

Raymond Hettinger added the comment:

I'm not clear on how non-use of the macro is causing your observed failures or whether that is due to a compiler bug.  That said, I don't see any downside to using Py_SIZE everywhere it is applicable.

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue27725>
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