8226389 [asm] : jlink tests fail; asm has wrong understanding of new bytecodes

[Roger Riggs]

Please review a patch to asm to correctly recognize the Valhalla defined 
bytecodes for defaultvalue and withfield.
(The jlink tests that read and write classfiles were failing).

Webrev:
   http://cr.openjdk.java.net/~rriggs/webrev-asm-8226389/

Thanks, Roger