RR(S): 8020943: Memory leak when GCNotifier uses create_from_platform_dependent_str()

[Kevin Walls]

Hi,

I'd like to get a review on this small change:

http://bugs.sun.com/bugdatabase/view_bug.do?bug_id=8020943
https://jbs.oracle.com/bugs/browse/JDK-8020943

webrev
http://cr.openjdk.java.net/~kevinw/8020943/webrev.00/

It turns out there's a leak in the gc notifier: reproduce by attaching 
e.g. JConsole and watching, if there is frequent GC the number of 
apparently unowned String objects that can't get collect continually 
increases.

In the notifier, the method it calls to create String objects involves a 
JNI call that leaves a Handle behind and doesn't get cleared.   There is 
a simpler method to call, there is no need for all that work, as we are 
dealing with a small set of simple strings in the JVM being converted, 
to describe the collection type, cause, ...

Thanks
Kevin