RFR: JDK-8007297: [pack200] allow opcodes with InterfaceMethodRefs

[Kumar Srinivasan]

Hello,

I will be pushing these changes  reviewed by jrose, please let me know
if you have any comments.

Bug:
https://jbs.oracle.com/bugs/browse/JDK-8007297

Webrev:
http://cr.openjdk.java.net/~ksrini/8007297/webrev.jdk.2/


Thanks
Kumar