RFR 8202578: Revisit location for class unload events

[Lois Foltan]

Looks good.
Lois

On 8/23/2018 6:55 PM, Harold David Seigel wrote:
> Hi,
>
> Please review this fix for JDK-8202578.  The fix enables posting of 
> JFR class unloading events without requiring a separate JFR-specific 
> iteration through the class loader data graph.
>
> Open Webrev: 
> http://cr.openjdk.java.net/~hseigel/bug_8202578/webrev/index.html
>
> JBS Bug:  https://bugs.openjdk.java.net/browse/JDK-8202578
>
> This fix was regression tested by running Mach5 tiers 1 and 2 tests 
> and builds on Linux-x64, Windows, and Mac OS X, running tiers 3-5 
> tests on Linux-x64, and by running JCK-11 Lang and VM tests on 
> Linux-x64. Additionally, the jdk JFR tests were run explicitly.
>
> Thanks, Harold
>