[issue19219] speed up marshal.loads()

[Serhiy Storchaka]

Serhiy Storchaka added the comment:

> You cannot change the meaning of TYPE_UNICODE (it uses "surrogatepass").
> Therefore, you have to use new opcodes with other semantics.

You don't need new semantic. Use old semantic. The set of ASCII encoded strings is a subset of valid UTF8 encoded strings, which is a subset of UTF8 encoded with "surrogatepass" strings.

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