RFR: Cherry-pick: 8227637: Adjust Shenandoah C2 verifier to recognize IN_NATIVE barriers

[Zhengyu Gu]

Okay.

Thanks,

-Zhengyu

On 7/15/19 12:37 PM, Roman Kennke wrote:
> Current sh/jdk is broken b/c Shenandoah's C2 verifier does't recognize
> the native barriers. Let's cherry-pick the fix to sh/jdk:
> 
> http://cr.openjdk.java.net/~rkennke/JDK-8227637/webrev.00/
> 
> Testing: hotspot_gc_shenandoah, ctw-tests
>