[Issue 20578] Parallel GC causes segfault in dl

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=20578

--- Comment #2 from Rainer Schuetze <r.sagitario at gmx.de> ---
(In reply to Hiroki Noda from comment #1)
> I'm not sure but https://github.com/dlang/druntime/pull/2904 may fixes this,
> which has been merged into dmd 2.090.1.

I think so, too. The crashing thread looks similar to what happened in LDCs
CircleCI tests (see
https://github.com/ldc-developers/ldc/issues/3127#issuecomment-571742913) and
it was fixed by that change.

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