RFR 8u: Cherry-pick 8140584: nmethod::oops_do_marking_epilogue always runs verification code

[Roman Kennke]

Am 23.05.2017 um 14:18 schrieb Aleksey Shipilev:
> Hi,
>
> shenandoah-8u runs into the serious performance problem with code cache scan --
> we are wasting several milliseconds per pause -- and it seems to be fixed in 8u152:
>   https://bugs.openjdk.java.net/browse/JDK-8140584
>
> I propose we cherry-pick it to our shenandoah-8u repo, while we wait for it to
> arrive from upstream.
>
> Andrew, any objections?
>
> Thanks,
> -Aleksey
>
Yes!