hg: jdk/jdk: 8210559: ClassLoaderData Symbols can leak

[coleen.phillimore at oracle.com]

Changeset: 9bf5205655ee
Author:    coleenp
Date:      2018-09-14 12:10 -0400
URL:       http://hg.openjdk.java.net/jdk/jdk/rev/9bf5205655ee

8210559: ClassLoaderData Symbols can leak
Summary: unrefcount the symbol names when the CLD is destroyed
Reviewed-by: lfoltan, jiangli, iklam

! src/hotspot/share/classfile/classLoaderData.cpp
! src/hotspot/share/prims/whitebox.cpp
! test/hotspot/jtreg/runtime/ClassUnload/UnloadTest.java
! test/hotspot/jtreg/runtime/testlibrary/ClassUnloadCommon.java
! test/lib/sun/hotspot/WhiteBox.java