RFR (XS) 8229998: Build failure after JDK-8227054

[Aleksey Shipilev]

Bug:
  https://bugs.openjdk.java.net/browse/JDK-8229998

Fix:
  https://cr.openjdk.java.net/~shade/8229998/webrev.01/

This is caused by rewiring for new OopStorage accessors. I think I got the new mappings correctly.
The other part of the build fix is JDK-8230024, which I do separately as backportable change.

Testing: hotspot_gc_shenandoah {fastdebug,release}

-- 
Thanks,
-Aleksey