Martin von Zweigbergk <martinvonz@google.com> [Wed, 25 Jul 2018 14:21:49 -0700] rev 3903
builddependencies: remove a use of defaultdict
I don't see much reason to make "rdependencies" be a defaultdict when
"dependencies" is not. It's easy to initialize each entry ourselves.
Martin von Zweigbergk <martinvonz@google.com> [Wed, 25 Jul 2018 15:30:37 -0700] rev 3901
builddependencies: don't remove found deps when divergence found (issue5946)
It seems obviously wrong to not keep any dependencies for a revision
that we had already found (for p1) if we run into divergence (from
p2). It also happens to fix issue5946 :)