RFR (XS): 8066497: Update c.o.j.t.ByteCodeLoader to be able really reload given class

[Pavel Chistyakov]

Hi all,

please review changes for: https://bugs.openjdk.java.net/browse/JDK-8066497
webrev: 
http://cr.openjdk.java.net/~iignatyev/pchistyakov/8066497/webrev.00/ 
<http://cr.openjdk.java.net/%7Eiignatyev/pchistyakov/8066497/webrev.00/>

Problem:
ByteCodeLoader allows one to load class with given name from existing 
bytecode. But if this class is already loaded by e.g. system classloader 
it cannot be redefined using another bytecode array because of 
delegation of loadClass call to parent classloader.

Solution:
override loadClass to break delegation for given className.

Testing: manual

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Thanks,
Pavel