RFR: Use correct load barrier in resolve_jobject

[Per Liden]

Looks good!

/Per

On 2018-02-13 14:56, Stefan Karlsson wrote:
> Hi all,
> 
> Please review this patch to use the correct load barrier when resolving 
> jweaks in MacroAssembler::resolve_jobject. The jweaks have phantom 
> strength and need to be loaded with the phantom version of the load 
> barrier.
> 
> http://cr.openjdk.java.net/~stefank/zgc/zResolveJobject/webrev.01/
> 
> Thanks,
> StefanK