Fix #2909: Port per-phase profiling from scalac#3801

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dotty-staging:port-phase-profiling

Jan 30, 2018

Commits on Jan 30, 2018

Fix #2909: Port per-phase profiling from scalac

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Avoid using Enumeration

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Port: improve benchmarking of multi-threaded compilation

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Port: Update scalac profiler - capture more info on background threads

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Avoid using Enumeration again

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AUTHORS.md: Add attribution for per-phase profiling
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AsyncHelper: scalac -> dotc
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