[issue20929] Undefined behavior flagged by Clang 3.4

[Jeffrey Walton]

Jeffrey Walton added the comment:

> Could you check if the current "default" branch of mercurial fixes the problems?

Checkout is complete. Working through a build now.

Could you look at http://bugs.python.org/issue20930 and advise on the best way to proceed?

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<http://bugs.python.org/issue20929>
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