Christian Kissig 730df5a437 [Support] Add KnownBits::computeForSubBorrow (#67788) ...

- [Support] Add KnownBits::computeForSubBorrow
- [CodeGen] Implement USUBC, USUBO_CARRY, and SSUBO_CARRY with
KnownBits::computeForSubBorrow
- [CodeGen] Compute unknown bits for Carry/Borrow for ADD/SUB
- [CodeGen] Compute known bits of Carry/Borrow for UADDO, SADDO, USUBO,
and SSUBO

Fixes #65893

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Co-authored-by: Shafik Yaghmour <shafik@users.noreply.github.com>

2023-10-18 13:48:47 +01:00

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