implement Add, Sub, CheckedAdd, CheckedSub, SaturatingAdd, Saturating… (#9594)
* implement Add, Sub, CheckedAdd, CheckedSub, SaturatingAdd, SaturatingSub for Perthings
* ifx inner >= max bug
* move arithmetic impl to main macro block
* implement CheckedMul for Perthings
* incorporate feedback
Co-authored-by:
Shawn Tabrizi <shawntabrizi@gmail.com>
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