backport to fix 4jdk8-tck
backport from src/main
remove unused local
backport some doc fixes
s/nonnull/non-null/
sync unstampedUnlockRead from src/main
sync tryReadLock from src/main
sync tryConvertToReadLock from src/main
tryConvertToOptimisticRead should return input optimistic stamp when currently read-locked
refactor write unlock mechanics into new method unlockWriteInternal
document that: StampedLocks have no notion of ownership
add more internal documentation about stamp decoding
whitespace
clarify what kind of stamp is being returned
refactor unlock to simply call unlockWrite or unlockRead
make loop style consistent
remove unnecessary <br>
clarify comment
Use same coding style with view methods as with Maps
fork jdk8 maintenance branch for source and jtreg tests
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