RFR: 8217856: ZGC: Break out C2 matching rules into separate AD file

[Nils Eliasson]

Hi Per,

Looks good!

// Nils

On 2019-01-28 10:04, Per Liden wrote:
> Break out ZGC specific C2 matching rules into separate AD file. This 
> patch also introduces the z_load_barrier_slow_reg() function to avoid 
> some code duplication.
>
> Bug: https://bugs.openjdk.java.net/browse/JDK-8217856
> Webrev: http://cr.openjdk.java.net/~pliden/8217856/webrev.0
>
> /Per