unexpected error in runtime: `AssertionError(msg="invalid inlining item")` on 1.8

[KristofferC]

Found in the PkgEval logs for 1.8: https://s3.amazonaws.com/julialang-reports/nanosoldier/pkgeval/by_hash/6acc46b_vs_3e092a2/PowerSimulationsDynamics.primary.log. Reproduces locally.

Talked to @aviatesk and he said he would look at it.