RFR: Trim down oop-equals verification

[Roman Kennke]

http://cr.openjdk.java.net/~rkennke/verify-obj-eq/webrev.00/

:-)

Am 26.09.18 um 20:02 schrieb Roman Kennke:
> This:
> - Renames VerifyStrictOopOperations to VerifyObjectEquals, this catches
> the intent better.
> - Removes the overrides for oop == void* because this is a case we are
> not actually interested in.
> - Fixes a bunch of places to not use unsafe_equals() and instead use the
> above oop == void* (most of them are actually reverts to upstream code)
> 
> Testing: tier3_gc_shenandoah
> 
> Ok?
> 
> Roman
> 
>