RFR: 8221984: Clean up ZOop

[Per Liden]

Thanks!

/Per

On 4/4/19 9:22 PM, Stefan Karlsson wrote:
> Looks good.
> 
> StefanK
> 
> On 2019-04-04 14:51, Per Liden wrote:
>> Mainly renaming ZOop::to_oop() to ZOop::from_address(), but also 
>> turning ZOop into a pure cast utility class. The other functions in 
>> this class weren't widely used.
>>
>> Bug: https://bugs.openjdk.java.net/browse/JDK-8221984
>> Webrev: http://cr.openjdk.java.net/~pliden/8221984/webrev.0
>>
>> /Per
>