RFR: Fixup root after failed init-partial phase

[Aleksey Shipilev]

On 10/16/2017 11:23 PM, Roman Kennke wrote:
> http://cr.openjdk.java.net/~rkennke/fixup-roots-after-init-partial/webrev.00/

Yes, this is symmetric with what we do on cancellation path in final-partial.

Looks good to me.

-Aleksey