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When simplify values we might end up with an instruction from a different scope or just one that does not dominate the use. If the instruction can be reproduced without side-effect (incl. UB) we can now do that. For now this is mostly used for speculatable (intrinsic) calls but as we learn to make things like arguments or loads available this will become more powerful. This will also allow us to remove dead stores more easily in a follow up.
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