feat(byte_sub_ptr): add ptr::byte_sub_ptr #121919
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This is an API that naturally should exist as a combination of byte_offset_from and sub_ptr both existing (they showed up at similar times so this union was never made). Adding these is a logical (and perhaps final) precondition of stabilizing ptr_sub_ptr (rust-lang#95892).
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This is an API that naturally should exist as a combination of byte_offset_from and sub_ptr both existing (they showed up at similar times so this union was never made). Adding these is a logical (and perhaps final) precondition of stabilizing ptr_sub_ptr (#95892).