Review request (S) 8003553: NPG: metaspace objects should be zeroed in constructors

[Coleen Phillimore]

Summary: Zero metadata in constructors, not in allocation (and some in 
constructors)

This seems like a good first step in passing initial values into 
constructors and no initializing metadata types by the callers (although 
a lot more parameters will have to be passed for some).

Tested with runThese jck, NSK vm.quick.testlist, lang and vm jck8, 
java/lang/annotation jtreg tests and java/lang/invoke jtreg tests.

open webrev at http://cr.openjdk.java.net/~coleenp/8003553/
bug link at http://bugs.sun.com/view_bug.do?bug_id=8003553

Thanks,
Coleen