[issue4294] Macros for PyLong: sign, number of digits, fits in an int

[STINNER Victor]

STINNER Victor <victor.stinner at haypocalc.com> added the comment:

Other optimization for long_compare(), long_lshift() and 
long_rshift().

Note: with all my patches, Python is a little bit faster (but not 
slower, which is already a good thing ;-)).

Added file: http://bugs.python.org/file11980/pylong_shift.patch

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