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[mypyc] Add primitive for abs(int) - #22363
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Fixes mypyc/mypyc#1094.
abs()on an int used to box it, go throughPyNumber_Absoluteand unbox the result. This addsCPyTagged_Absolute, modeled onCPyTagged_Negate: short ints are handled inline, and long intsfall back to
PyNumber_Absolute. So does -2**62, since its absolute value doesn't fit in a short int.A loop summing
abs(i)over 2M ints went from 138 ms to 18 ms for me (Python 3.14 on Windows,median of 9 runs).