[Issue 18544] Thread-safety of "proto" GC before initialisation

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=18544

--- Comment #2 from Steven Schveighoffer <schveiguy at yahoo.com> ---
Hm.. actually that doesn't work, because one thread could be adding roots while
the other one is initializing the GC, causing a race.

There may just have to be some sort of lock, even if it's a simple/spin lock.

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