RFR [sh/11]: Move Shenandoah clone-expansion from shared code to ShBSC2

[Aleksey Shipilev]

On 10/30/19 3:28 PM, Roman Kennke wrote:
> This is a follow-up to recent jdk11u merge. It moves the Shenandoah
> clone-expansion code to ShBSC2.
> 
> http://cr.openjdk.java.net/~rkennke/sh11-c2clone/webrev.00/

jdk/jdk has clone_needs_barrier in the condition here:

  if (ShenandoahCloneBarrier && clone_needs_barrier(src, phase->igvn())) {

Does it make sense in sh/jdk11? There is a definition of clone_needs_barrier already, but it is unused.

-- 
Thanks,
-Aleksey