Revert "bpo-38135: Fix depth-first-search computation in compile.c" #16050
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Reverts #16042. As Mark just elaborated in person, this code doesn't do the right thing in the case where "D" and "E" are both branches from "C" (but not direct links from the chain), but "D" is also a branch off of "E". Since it doesn't matter for the current compiler, and this requires more work to get exactly right, better to fold that into the bigger compiler changes.
https://bugs.python.org/issue38135