[SCEV] Model ptrtoint(SCEVUnknown) cast not as unknown, but as zext/trunc/self of SCEVUnknown
While we indeed can't treat them as no-ops, i believe we can/should do better than just modelling them as `unknown`. `inttoptr` story is complicated, but for `ptrtoint`, it seems straight-forward to model it just as a zext-or-trunc of unknown. This may be important now that we track towards making inttoptr/ptrtoint casts not no-op, and towards preventing folding them into loads/etc (see D88979/D88789/D88788) Reviewed By: mkazantsev Differential Revision: https://reviews.llvm.org/D88806
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