RFR: 8289257: Some custom loader tests failed due to symbol refcount not decremented [v2]

[Calvin Cheung]

> Removing the test for class loader name symbol refcount since similar test exists in runtime/ClassUnload/UnloadTest.java.
> 
> Tested locally on linux-x64 with ZGC. Running more tests via mach5.
> 
> An alternative approach would be adding a `WB.fullGC()` call after `ClassUnloadCommon.triggerUnloading()` as follows:
> 
> 
> --- a/test/hotspot/jtreg/runtime/cds/appcds/customLoader/test-classes/HelloUnload.java
> +++ b/test/hotspot/jtreg/runtime/cds/appcds/customLoader/test-classes/HelloUnload.java
> @@ -105,6 +105,7 @@ public class HelloUnload {
>  
>              urlClassLoader = null; c = null; o = null;
>              ClassUnloadCommon.triggerUnloading();
> +            wb.fullGC();
>              System.out.println("Is CustomLoadee alive? " + wb.isClassAlive(className));
>              ClassUnloadCommon.failIf(wb.isClassAlive(className), "should have been unloaded");

Calvin Cheung has updated the pull request incrementally with one additional commit since the last revision:

  remove System.currentTimeMillis() from class loader name

-------------

Changes:
  - all: https://git.openjdk.org/jdk/pull/9340/files
  - new: https://git.openjdk.org/jdk/pull/9340/files/a963936c..cbd63cdb

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=9340&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=9340&range=00-01

  Stats: 1 line in 1 file changed: 0 ins; 0 del; 1 mod
  Patch: https://git.openjdk.org/jdk/pull/9340.diff
  Fetch: git fetch https://git.openjdk.org/jdk pull/9340/head:pull/9340

PR: https://git.openjdk.org/jdk/pull/9340