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compiler_rt: add __absvsi2, __absvdi2, __absvti2

- abs can only overflow, if a == MIN
- comparing the sign change from wrapping addition is branchless
- tests: MIN, MIN+1,..MIN+4, -42, -7, -1, 0, 1, 7..

See #1290
405ff911daJan Philipp Hafer committed on 12/26/2021, 9:21:18 PM· committed by Andrew Kelleyparent71923d7
6 files changedLine totals unavailable