test/java/util/concurrent/forkjoin/SubmissionTest.java should respect jtreg timeout factor.

test/java/util/concurrent/locks/StampedLock/ReadersUnlockAfterWriteUnlock.java should not run for 10 seconds

src/java.base/share/classes/java/util/concurrent/atomic/AtomicInteger.java:
Need to change VarHandle reference from addAndGet to getAndAdd.