RFR: Remove narrowOop variants of oopDesc::equals and related methods

[Aleksey Shipilev]

On 03/19/2018 09:16 PM, Roman Kennke wrote:
> Turns out that we don't actually need the narrowOop versions of
> oopDesc::equals() and all the related methods. This patch removes them.
> The remaining stuff is being worked on upstream right now, and will
> hopefully go away soon too.
> 
> http://cr.openjdk.java.net/~rkennke/equals-narrowop/webrev.00/
> 
> Test: hotspot_gc_shenandoah fastdebug
> 
> Ok?

OK, good!

-Aleksey