8077392: Stream fork/join tasks occasionally fail to complete 8131715: backout the fix for JDK-8079359 when JDK-8077392 is fixed Summary: Add missing BasicLock::_displaced_header init to ObjectSynchronizer::quick_enter() and re-enable Contended Locked "fast enter" bucket. Reviewed-by: gthornbr, dholmes, kvn, cvarming, acorn

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