More shadow bugs/fixes #218
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It's not correct to divide a bit size by the number of bits-per-byte, since things like i1 end up being zero-byte-sized. Also `sizeof(uintptr_t)` was being used as a proxy for bits-per-byte, which isn't universally true.
This cast isn't consumed by any later IR instructions, so it is probably reaped by LLVM's DCE. Probably a leftover from when LLVM didn't have opaque pointers.
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A few bits I noticed when auditing the shadow stack logic last week.
Once this (and the other yk PR) is in, I will make another "sync ykllvm" PR on the yk side.