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librustc_mir: Add support for const fn offset/arith_offset
Miri's pointer_offset_inbounds implementation has been moved into librustc_mir as ptr_offset_inbounds (to avoid breaking miri on a nightly update). The comments have been slightly reworked to better match `offset`'s external documentation about what causes UB. The intrinsic implementations are taken directly from miri. Signed-off-by: Joe Richey <joerichey@google.com>
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