[issue27492] Enhance bytearray_repr with bytes_repr's logic

[Serhiy Storchaka]

Serhiy Storchaka added the comment:

Bytes and bytearray share a much of code. I think it is possible to share the implementation of reprs. Just add two functions in bytes_methods.c: one counts the size of the repr and determines the quote, and other writes the content of the repr in preallocated buffer.

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versions:  -Python 3.5

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<http://bugs.python.org/issue27492>
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