RFR: Parallel safepoint cleaning

[Aleksey Shipilev]

On 05/23/2017 07:28 PM, Roman Kennke wrote:
> http://cr.openjdk.java.net/~rkennke/par-sp-cleaning/webrev.01/

Cursory review:

s/ShenandoahSPCleanup/ShenandoahMergeSafepointCleanup/g ?
s/ParallelSPCleanup/ParallelSafepointCleanup/g ?

vm_operations_shenandoah.hpp:
 *) Methods can reside in VM_ShenandoahOperation super-class, no?

synchronizer.cpp:
 *) Better name: deflate_tl?
1689 void ObjectSynchronizer::deflate_idle_monitors(bool deflate_tl) {

Interesting how the parallel safepoint cleanup would get accepted upstream.

-Aleksey