backport exceptionally* methods to fix 4jdk8-tck target
backport 8186265: Make toString() methods of "task" objects more useful
sync with src/main
backport CompletableFuture.java to src/jdk8
sync src/main to src/jdk8
Avoid unnecessary signal
Only help complete if FJ worker
Faster cleanup
reduce async overhead
fork jdk8 maintenance branch for source and jtreg tests
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