RFR(S): 8211233: MemBarNode::trailing_membar() and MemBarNode::leading_membar() need to handle dying subgraphs better

[Vladimir Kozlov]

Looks good.

Thanks,
Vladimir

On 9/27/18 9:05 AM, Roland Westrelin wrote:
> 
> http://cr.openjdk.java.net/~roland/8211233/webrev.00/
> 
> I hit a bug where MemBarNode::leading_membar() doesn't return the right
> result because a dying part of the graph between a trailing and a
> leading membars is not properly handled.
> 
> Roland.
>