RFR(XXS): ZGC: C2: Remove unused code

[Per Liden]

On 05/11/2018 10:37 AM, Nils Eliasson wrote:
> Hi,
> 
> Removing a TypeTuple that has no uses.
> 
> http://cr.openjdk.java.net/~neliasso/zgc/clean

Looks good!

/Per

> 
> Regards,
> 
> Nils
>