RFR: jdk11: guard shared code with UseShenandoahGC

[Aleksey Shipilev]

On 10/17/2018 05:38 PM, Roland Westrelin wrote:
>>> I also propose we drop the changes related to the register doubling stuff from 11.
>>
>> Not sure, why? Can we "just" protect them with UseShenandoahGC as well?
> 
> In previous releases, we dropped mid/large size shared code changes that
> were not upstream and not required. That one hasn't proven to bring any
> benefit either, it could most likely be guarded by UseShenandoahGC but
> it just seems simpler/safer to remove it.

That makes sense. Okay then!

-Aleksey