[8u] RFR for JDK-8152438: Threads may do significant work out of the non-shared overflow buffer

[Shafi Ahmad]

Hi,

Please review the backport of bug: "JDK-8152438: Threads may do significant work out of the non-shared overflow buffer" to jdk8u.

Please note that the backport is not clean. The import conflict is due to:
  1. File taskqueue.inline.hpp doesn't exist in jdk8 so I have added code change done in this file to taskqueue.hpp. 
  2. File name path change.

Webrev link: http://cr.openjdk.java.net/~shshahma/8152438/webrev.00/
Jdk9 bug: https://bugs.openjdk.java.net/browse/JDK-8152438
Original patch pushed to jdk9: http://hg.openjdk.java.net/jdk9/jdk9/hotspot/rev/07109ac130cd

Testing: jprt and running jtreg [not completed].

Regards,
Shafi