RFR [9] Remove sun.misc.Unsafe dependency from sun.nio.cs.StringUTF16

[Alan Bateman]

On 09/12/2015 11:44, Chris Hegarty wrote:
> Looks like the Compact Strings work inadvertently introduced a
> dependency on sun.misc.Unsafe. ( just temporary confusion with
> having two Unsafes until the jdk.unsupported module is defined )
Looks okay to me too, probably best to use the opportunity to add an 
import to avoid repeating the package name.

-Alan