RFR: Remove fix-roots pass in ShHeap

[Aleksey Shipilev]

On 10/30/2018 05:21 PM, Roman Kennke wrote:
> We have an extra fix-roots pass in ShHeap that is supposed to fix up any
> roots after cancelled init-evac pass. This is a cludge that predates the
> evac-oom-handler. Now that we have a reliable evac-oom-handler, this
> would take care of that. We can remove that pass.
> 
> Testing: tier3_gc_shenandoah ok
> 
> http://cr.openjdk.java.net/~rkennke/remove-fixroots/webrev.00/

Makes sense, looks good.

-Aleksey