Fix handling of cycles in AST traversal in Dependency Analyzer #1519
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Unfortunately I can't quickly figure out how to create a public repro for this one (any help would be appreciated). During the last few years I faced this issue 4 times, where scalac worker got into the infinite loop.
I've added explicit tracking of cycles using
mutable.Set[Tree]of visited tree notes, which seems to be fixing the infinite loop problem.