Remove the overflow checks for wrapping_offset #3589
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This PR removes the overflow checks done for the
arith_offsetintrinsic, which is used in implementation ofptr::wrapping_offset. According to the documentation, this operation is always safe:https://doc.rust-lang.org/std/primitive.pointer.html#method.wrapping_offset
https://doc.rust-lang.org/std/intrinsics/fn.arith_offset.html
See #3582 (comment) for the context.
Resolves #3582
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