[issue26526] In parsermodule.c, replace over 2KLOC of hand-crafted validation code, with a DFA

[Serhiy Storchaka]

Changes by Serhiy Storchaka <storchaka at gmail.com>:


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stage:  -> patch review

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue26526>
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