Pretty-print MIR user types too.#158982
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ty::UserTypeis currently dumped in MIR using debug-printing of types. Unfortunately, this shows the inner index of DefIds, which can change between compilations depending oncfgflags.This PR proposes to wire
ty::UserTypeinto the normal pretty-printing infra, which will give more readable outputs. This also adds a test, as we did not have any mir-opt case featuring non-Noneuser_self_ty.Exact formatting to bikeshed.