[issue1692335] Fix exception pickling: Move initial args assignment to BaseException.__new__

[Martin v. Löwis]

Martin v. Löwis added the comment:

I tested exception_pickling_25.diff, and it may break existing code.
In 2.5.1, Exception("Hello,4).__reduce__() gives 
(<type 'exceptions.Exception'>, ('Hello', 4))

With the patch, it gives

TypeError: can't pickle Exception objects

IMO, that is an unacceptable change for a bugfix release.

Aside: please give unique file names to the patches, or remove patches
if you want to replace a previous patch.

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nosy: +loewis

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