[8u-dev] Request for approval : 8058547: Memory leak in ProtectionDomain cache

[Seán Coffey]

I'd like to backport this memory leak fix to jdk8u-dev. Patch applies 
cleanly post path shuffling.

bug report : https://bugs.openjdk.java.net/browse/JDK-8058547
jdk 9 changeset : http://hg.openjdk.java.net/jdk9/dev/jdk/rev/57d07aa0a0eb

regards,
Sean.