[Issue 24830] separate compilation + circular deps + templated opCmp = missing symbols

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=24830

--- Comment #1 from ilya.yanok at gmail.com ---
This happens since even though while processing the second `Option!string`
instantiation we try to update the `minst` of all children to the root module,
it fails to update the automatically generated `__xopCmp` method (and friends).
I have a fix and currently am working on the test case. I'll send a PR soon.

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