[issue27938] PyUnicode_AsEncodedString, PyUnicode_Decode: add fast-path for "us-ascii" encoding

[koobs]

koobs added the comment:

Re-open and assign for regressions. Observed in all koobs-freebsd* buildbots (9/10/11) and build types. Issue is in default branch (add version 3.7)

First failing test run: http://buildbot.python.org/all/builders/AMD64%20FreeBSD%20CURRENT%20Non-Debug%203.x/builds/110

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assignee:  -> haypo
nosy: +koobs
resolution: fixed -> 
versions: +Python 3.7

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue27938>
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