Jan Philipp Hafer 17046674a7 compiler_rt: add __negvsi2, __negvdi2, __negvti2
- neg can only overflow, if a == MIN
- case `-0` is properly handled by hardware, so overflow check by comparing
  `a == MIN` is sufficient
- tests: MIN, MIN+1, MIN+4, -42, -7, -1, 0, 1, 7..

See #1290
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