RFR (xs) 8039150: host_klass invariant fails when verifying newly loaded JSR-292 anonymous classes

[Coleen Phillimore]

Summary: Initialize host_klass while parsing the class with the other 
initializations.

We really should initialize more fields in metadata constructors rather 
than outside them in parseClassFile but this is a smaller change.

Tested with fast.vm.quick.testlist and java/lang/invoke tests and 
verified dacapo with VerifyBefore and AfterGC.

open webrev at http://cr.openjdk.java.net/~coleenp/8039150/
bug link https://bugs.openjdk.java.net/browse/JDK-8039150


Thanks,
Coleen