RFR: 8073387: Move VerifyOopClosures out from genOopClosures.hpp

[Stefan Karlsson]

Hi,

Please review this patch to move VerifyOopClosures out from 
genOopClosures.hpp. This way users of VerifyOopClosures don't have to 
include genOopClosures.hpp anymore. The implementation of 
VerifyOopClosures::do_oop_work is placed in oop.cpp, where the other 
VerifyOopClosure functions are located.

http://cr.openjdk.java.net/~stefank/8073387/webrev.01/
https://bugs.openjdk.java.net/browse/JDK-8073387

Thanks,
StefanK