RFR (sh/11) Proper fix for C2-unrolled-clone with Shenandoah LRB

[Aleksey Shipilev]

On 8/1/19 10:31 PM, Roman Kennke wrote:
> Recently I proposed and pushed:
> 
> https://hg.openjdk.java.net/shenandoah/jdk11/rev/be804150fdf2
> 
> Testing shows that this is not enough. The story around unrolling clone
> is fairly complicated pre-jdk12, and the proper fix seems to revert the
> above, and properly insert LRBs into unrolled clone loops. It basically
> matches what we did pre-LRB by inserting RBs in those places.
> 
> http://cr.openjdk.java.net/~rkennke/jdk11-c2-unroll-clone-fix/webrev.00/

OK, let's do it.

-- 
Thanks,
-Aleksey