RFR: 8257082: ZGC: Clean up ZRuntimeWorkers and ZWorkers

Thu Nov 26 08:27:55 UTC 2020

On Wed, 25 Nov 2020 14:23:51 GMT, Per Liden <pliden at openjdk.org> wrote:

> Found some additional stuff in ZRuntimeWorkers and ZWorkers that could be cleaned up.
> * `ZThread::set_runtime_worker()` and friends are no longer used, and can be remove
> * Fixed obsolete comment
> * Added a missing `zTask.hpp` include
> * Replaced `Monitor` with `ZConditionLock`

Marked as reviewed by stefank (Reviewer).

-------------

PR: https://git.openjdk.java.net/jdk/pull/1436