[Issue 18843] -deps -unittest causes cataclysmic memory usage

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=18843

--- Comment #3 from FeepingCreature <default_357-line at yahoo.de> ---
Actually, I just tried this on a bit bigger project. And if there's a lot of
imports, it looks more like 1s (no -deps=) vs 5s (with -deps=). Looks like it's
mostly Semantic3OnDependencies, which makes sense if `-deps` forces compilation
so it can look inside for more imports. So I'd still need a way to limit the
scope of `-deps` from the commandline.

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