RFR (trivial): 8216197: Remove unused new_hash methods

[Kim Barrett]

> On Jan 6, 2019, at 5:20 PM, Claes Redestad <claes.redestad at oracle.com> wrote:
> 
> Hi,
> 
> another trivial(?) cleanup.
> 
> Webrev: http://cr.openjdk.java.net/~redestad/8216197/open.00/
> Bug:    https://bugs.openjdk.java.net/browse/JDK-8216197
> 
> Thanks!
> 
> /Claes

Looks good, and trivial.