Alan Agius dc40a93317 perf(ngcc): spawn workers lazily (#35719)
With this change we spawn workers lazily based on the amount of work that needs to be done.

Before this change we spawned the maximum of workers possible. However, in some cases there are less tasks than the max number of workers which resulted in created unnecessary workers

Reference: #35717

PR Close #35719
2020-03-02 08:17:02 -08:00
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