Wesley Wigham 5f4436d433 Keep a small reserve of tasks to not-batch, so all threads can have always have an initial task (#18696)
* Keep a small reserve of tasks to not-batch, so all threads can have an initial task"

* Assign no weight to new tests, but still place them at the end of the list
2017-09-22 14:44:26 -07:00
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