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

[Thomas Schatzl]

Hi,

On Thu, 2019-07-25 at 19:41 -0400, 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/
> 

  looks good.

Thomas