Jan Philipp Hafer 405ff911da 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
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