RFR: Missing UseShenandoahGC checks for g1_wb_pre_call elimination

[Roman Kennke]

Yes

On Thu, Feb 15, 2018 at 3:56 PM, Aleksey Shipilev <shade at redhat.com> wrote:
> http://cr.openjdk.java.net/~shade/shenandoah/c2-protect-1/webrev.01/
>
> Should be self-obvious. We have this code in sh/jdk9 and sh/jdk8u, but not in sh/jdk10. And G1 may
> enter those paths without the checks!
>
> Testing: hotspot_gc_shenandoah
>
> Thanks,
> -Aleksey
>