make some methods static as suggested by errorprone [MethodCanBeStatic]
fix unused imports reported by errorprone [RemoveUnusedImports]
allocate WorkQueue array last to help memory layout
switch to non-deprecated Constructor.newInstance
s/nonnull/non-null/
ensure signal in dependent submit
Compatibly report parallelism 0; enable async blocker helping
fork jdk8 maintenance branch for source and jtreg tests
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