RFR(S): 8228631: Fix inconsistent OopStorage::Block owner usage

[Kim Barrett]

> On Jul 26, 2019, at 8:36 AM, Per Liden <per.liden at oracle.com> wrote:
> 
> Looks good!

thanks.

> 
> /Per
> 
> On 7/26/19 1:41 AM, Kim Barrett wrote:
>> Please review this cleanup of the use of the _owner member of
>> OopStorage blocks.  It's now just the intptr_t address of the owning
>> storage object, and no longer sometimes used as the actual owning
>> object.
>> CR:
>> https://bugs.openjdk.java.net/browse/JDK-8228631
>> Webrev:
>> http://cr.openjdk.java.net/~kbarrett/8228631/open.00/
>> Testing:
>> mach5 tier1