Unify threading between crossgen2 and ilc #63282
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They don't have to differ in the `--parallelism` vs `--singlethreaded` argument.
ghost
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They don't have to differ in the
--parallelismvs--singlethreadedargument.Capping the number of threads seems to improve compile throughput by about 0.5%, although I was hoping for a better improvement compared to the brute force "throw workitems on the threadpool" approach.