RFR: 8073388: Get rid of the dependency from handles.hpp to oop.inline.hpp

[Stefan Karlsson]

Hi,

Please review this patch to get rid of depencies from handles.hpp to 
oop.inline.hpp. There's no explicit include of oop.inline.hpp but 
oop_is_instance is used in handles.hpp. I've moved the usage of 
oop_is_instance to handles.cpp files and cleaned up the includes a bit.

This patch is extracted from a bigger patch to clean up some of our GC 
code dependencies in oop_iterate.

http://cr.openjdk.java.net/~stefank/8073388/webrev.01/
https://bugs.openjdk.java.net/browse/JDK-8073388

Thanks,
StefanK