RFR: 8222550: runtime/MemberName/MemberNameLeak.java times out

[Stefan Karlsson]

Hi all,

Please review this patch to fix a timeout in the MemberNameLeak test.

https://cr.openjdk.java.net/~stefank/8222550/webrev.01/
https://bugs.openjdk.java.net/browse/JDK-8222550

The test could fail if GCs happened during the setup phase when entries 
for all generated methods were created. When this happened the code to 
grow the table was triggered, which in turn cleaned out all so-far 
created entries.  This put the table in a condition where the grow / 
cleaning code didn't have to be triggered again. But the test still 
waited for it to happen. This patch adds all MethodHandles to an 
ArrayList, so that they are kept alive until it's time for them to be 
cleaned out. While debugging this timeout I added some extra logging. 
I've left it in the test in case we ever need to debug it again.

Testing: tier1-3 and multiple tier1_runtime runs on osx where the 
timeouts reproduced.

The patch is applied on top of the patch in:
https://mail.openjdk.java.net/pipermail/hotspot-runtime-dev/2019-April/033820.html

Thanks,
StefanK