Revert^4 "Implement LockSupport.park with a futex"

This reverts commit 13f4d9631db981ae5008073db4df9c6a934fc9f3.

Reason for revert: Fixing ThreadStress timeouts.

Change-Id: I9f8c3f56eccfadc3751049731e8d427873cc7841
7 files changed