JDK 9 RFR of 8039474: sun.misc.CharacterDecoder.decodeBuffer should use getBytes(iso8859-1)

[Brian Burkhalter]

Hello,

Issue:  https://bugs.openjdk.java.net/browse/JDK-8039474
Patch:  http://cr.openjdk.java.net/~bpb/8039474/webrev.00/

The change is to specify the charset for the String where none had been before. 
The extant test sun/misc/Encode/GetBytes.java appears to suffice for this.

Thanks,

Brian