[IR] Handle trunc for ptrtoaddr(inttoptr) cast pair (#162842) For ptrtoint(inttoptr) and ptrtoaddr(inttoptr), handle the case where the source and destination size do not match and convert to either zext or trunc. We can't do this if the middle size is smaller than both src/dest, because we'd have to perform an additional masking operation in that case. Most of these cases are handled by dint of ptrtoint/inttoptr size canonicalization (so I added some unit tests instead). However, the ptrtoaddr(inttoptr) case where the pointer size and address size differ is relevant, as in that case the mismatch in integer sizes is canonical.
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