[issue28410] Add convenient C API for "raise ... from ..."

[Emanuel Barry]

Emanuel Barry added the comment:

I see the function is private; is there any concern with extending the PyErr_* API? I think it'd make sense to expose it, since it's a convenient way to do in C what can already be done easily in Python, but I don't actually have a good reason :)

Other than this small nitpick, this LGTM.

(Alternatively, we can keep it private for 3.6 and revise that decision for 3.7)

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