8150523: improve jtreg test timeout handling, especially -timeout:
Reviewed-by: martin, psandoz, smarks

8142441: Improve jtreg tests for java.util.concurrent
Reviewed-by: martin, psandoz, chegar, shade, plevart

8134855: Bulk integration of java.util.concurrent.locks classes
8051848: ReentrantReadWriteLock.ReadLock fails on unlock by different thread
8049843: Lack of save / restore interrupt mechanism undermines the StampedLock
Reviewed-by: martin, psandoz, chegar

8136583: Core libraries should use blessed modifier order
Summary: Run blessed-modifier-order script (see bug)
Reviewed-by: psandoz, chegar, alanb, plevart

8005697: Add StampedLock
Reviewed-by: chegar, alanb, dice, martin