[issue30124] Fix C aliasing issue in Python/dtoa.c to use strict aliasing on Clang 4.0

[Mark Dickinson]

Mark Dickinson added the comment:

@haypo: for your strict-aliasing notes collection, I highly recommend the recent paper "Detecting Strict Aliasing Violations" by P. Cuoq et. al.

http://trust-in-soft.com/wp-content/uploads/2017/01/vmcai.pdf

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<http://bugs.python.org/issue30124>
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