RFR: 8202709: Move oopDesc::is_archive_object to MetaspaceShared::is_archive_object

[Stefan Karlsson]

Hi all,

Please review this patch to move oopDesc::is_archive_object to 
MetaspaceShared::is_archive_object.

http://cr.openjdk.java.net/~stefank/8202709/webrev.01/
https://bugs.openjdk.java.net/browse/JDK-8202709

The motivation for this patch is to move dependencies to G1 out of 
oopDesc. I've placed the functions in MetaspaceShared, within 
INCLUDE_CDS_JAVA_HEAP guards, where related functions G1 Archive 
functions can be found.

Thanks,
StefanK