Minor optimizations based on ParallelContext having nworkers_launched.
Originally, we didn't have nworkers_launched, so code that used parallel contexts had to be preprared for the possibility that not all of the workers requested actually got launched. But now we can count on knowing the number of workers that were successfully launched, which can shave off a few cycles and simplify some code slightly. Amit Kapila, reviewed by Haribabu Kommi, per a suggestion from Peter Geoghegan.
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