RFR: Trim unused code from Shenandoah SA

[Aleksey Shipilev]

On 11/30/18 12:45 PM, Roman Kennke wrote:
> There's quite a lot of code that can be trimmed out of Shenandoah SA
> code, now that the broken heap walking is out.
> 
> Testing: manual jstack test, hotspot_gc_shenandoah (ongoing)
> 
> http://cr.openjdk.java.net/~rkennke/trim-shenandoah-sa/webrev.00/

Looks okay, *but* field renames should go in separately.

Look at it this way: we have to have the possibility to plainly revert all these changesets when
heap iteration is back in order. Doing so with your current patch would revert the field renames too.

-Aleksey