[issue19219] speed up marshal.loads()

[Antoine Pitrou]

Antoine Pitrou added the comment:

> Why adding ASCII strings, whereas you can add Latin1 (UCS1, U+0000-U+00FF)
> strings?

Reasons:
- most strings in pyc files are pure ASCII (it's like 99% in the stdlib)
- unmarshalling ASCII strings is faster: you can pass 127 to PyUnicode_New without scanning for non-ASCII chars

The aim here is to optimize the common cases. There is no reason to further complicate the code for rare cases.

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<http://bugs.python.org/issue19219>
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