[sw] Document a policy on 64-bit division in SW code
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Since Apr 28, 2026.
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Description
Should we document a policy somewhere:
- 64-bit divide operations via the compiler-helpers `__udivdi3` (and friends) is banned //sw/device/silicon_creator/...
- If you need a 64-bit divide, use `math_slow_div64` (or whatever).
- In , 64-bit divide is not banned.
_Originally posted by @cfrantz in https://github.com/lowRISC/opentitan/issues/29861#issuecomment-4298686314_
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