RFR: 8152953: ForceSafepoint operations should be more specific

[coleen.phillimore at oracle.com]

Hi Robbin,
This looks good.
Coleen

On 5/23/17 2:31 PM, Robbin Ehn wrote:
> Hi all, please review.
>
> The empty ForceSafepoint operation is now specified by a subclass.
>
> Webrev: http://cr.openjdk.java.net/~rehn/8152953/
> Bug: https://bugs.openjdk.java.net/browse/JDK-8152953
>
> Passes hotspot_tier1
>
> Thanks, Robbin