PkgEval failure due to `KeyError`

https://s3.amazonaws.com/julialang-reports/nanosoldier/pkgeval/by_hash/f51f24c_vs_2ca8b0c/PProf.primary.log

```
Got exception outside of a @test
KeyError: key 0x00007fb686828010 not found
Stacktrace:
[1] getindex
@ ./dict.jl:498 [inlined]
[2] pprof(data::Nothing, lidict::Nothing; sampling_delay::Nothing, web::Bool, webhost::String, webport::Int64, out::String, from_c::Bool, full_signatures::Bool, drop_frames::Nothing, keep_frames::Nothing, ui_relative_percentages::Bool)
@ PProf ~/.julia/packages/PProf/SfsWK/src/PProf.jl:199
[3] macro expansion
@ ~/.julia/packages/PProf/SfsWK/test/PProf.jl:39 [inlined]
```

I think I've seen this in CI before; never tracked it down though.