RFR 8227866: Shenandoah: Split weak root processing and class unloading in parallel cleaning task

[Thomas Schatzl]

Hi,

On Wed, 2019-07-17 at 13:41 -0400, Zhengyu Gu wrote:
> Currently, Shenandoah uses shared ParallelCleaningTask to perform
> STW cleaning task, the cleaning task performs class unloading along 

  since the ParallelCleaningTask has originally moved from g1 code to
shared to allow use with Shenandoah, now that the code is not used by
Shenandoah any more, please move ParallelCleaningTask back to G1
specific code.

Thanks,
  Thomas