RFR: JDK-8163808 fix vtable assertion and logging for older classfiles

[Karen Kinnear]

Please review:
https://bugs.openjdk.java.net/browse/JDK-8163808

http://cr.openjdk.java.net/~acorn/8163808.hs/webrev

Bug: For classfiles before class file version 51, JVMS did not support transitive over-ride behavior. 
Implementation needed to check this in three places, not just one. Vtable size calculation is only exact
for later classfile versions.

Also fixed vtable logging output - since the method name-and-sig printing was changed to also print
the holder’s class name, we do not need to print the holder’s class name separately - it was printing twice.

Testing: linux-x64-slowdebug
rbt hs-nightly-runtime.js
jck vm,lang, api.java.lang
small invocation tests

thanks,
Karen