RFR: Disambiguate "upgrade to Full GC" GCause

[Roman Kennke]

Am 12.04.2018 um 11:01 schrieb Aleksey Shipilev:
> http://cr.openjdk.java.net/~shade/shenandoah/gccause-upgrade/webrev.01/
> 
> Cancelling with "Allocation Failure" from inside the degenerated GC is not entirely correct. Let's
> have "Allocation Failure" reserved for the original AF only.
> 
> Testing: hotspot_gc_shenandoah
> 
> Thanks
> -Aleksey
> 

This makes sense. Patch looks good!

Roman