RFR(XS) 8224115: Shenandoah: Eliminate RWLock that protects recorded nmethod data array

[Aleksey Shipilev]

On 5/20/19 1:26 PM, Zhengyu Gu wrote:
> Split the original patch, moved root processing changes that deal with traversal GC problem into
> JDK-8224179.
> 
> Updated webrev: http://cr.openjdk.java.net/~zgu/JDK-8224115/webrev.01/

Looks fine, except:

What is this removal? It does not seem related:

 248 ShenandoahAllCodeRootsIterator ShenandoahCodeRoots::iterator() {
 249   return ShenandoahAllCodeRootsIterator();
 250 }
 251
 252 ShenandoahCsetCodeRootsIterator ShenandoahCodeRoots::cset_iterator() {
 253   return ShenandoahCsetCodeRootsIterator();
 254 }

-Aleksey