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d06ceffd02
The fix can make this test run unconditionally. This moves code from 5c619882bc4911a2c9e7d0bb491b9e50d27afcd7 for testability but doesn't fix it yet. The #1282 problem remains (when I wrote its wake-up mechanism, I forgot there were N DERP readers funneling into 1 UDP reader, and the code just isn't correct at all for that case). Also factor out some test helper code from BenchmarkReceiveFrom. The refactoring in magicsock.go for testability should have no behavior change. (cherry picked from commit 6d2b8df06df1d20d4ae92793a066340bb26b6e25)