[issue12751] Use macros for surrogates in unicodeobject.c

[Antoine Pitrou]

Antoine Pitrou <pitrou at free.fr> added the comment:

> HIGH_SURROGATE and LOW_SURROGATE require that their ordinal argument
> has been preproceed to fit in [0; 0xFFFF]. I added this requirement in
> the comment of these macros.

The macros should preprocess the argument themselves. It will make the
code even simpler.
Otherwise +1.

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<http://bugs.python.org/issue12751>
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