RFR (S) 8196199: Remove miscellaneous oop comparison operators

[coleen.phillimore at oracle.com]

CheckUnhandledOops had defined some oop comparison operators that will 
have to be rewritten for new GCs.   Kim Barrett did most of this change. 
   See CR for more info.

Tested with JPRT (using currently supported GCs) tier1 and locally.

open webrev at http://cr.openjdk.java.net/~coleenp/8196199.01/webrev
bug link https://bugs.openjdk.java.net/browse/JDK-8196199

Thanks,
Coleen