RFR: 8202082: Remove explicit CMS checks in CardTableBarrierSetAssembler

[Thomas Schatzl]

Hi,

On Fri, 2018-04-20 at 16:43 +0200, Erik Österlund wrote:
> Hi,
> 
> In CardTableBarrierSetAssembler, we sometimes need fencing due to
> the 
> card table being scanned concurrently when using CMS with pre-
> cleaning. 
> Rather than explicitly checking for those CMS flags in the generic 
> CardTableBarrierSetAssembler class, it is preferrable to check the 
> CardTable scanned_concurrently() property which already precisely 
> reflects that.
> 
> Bug:
> https://bugs.openjdk.java.net/browse/JDK-8202082
> 
> Webrev:
> http://cr.openjdk.java.net/~eosterlund/8202082/webrev.00/

  looks good.

Thomas