[11u] RFR: 8230402: Allocation of compile task fails with assert: "Leaking compilation tasks?"

[Lindenmaier, Goetz]

Hi,

I am downporting this for parity with 11.0.9-oracle.
I had to resolve the test description.
I added the @requires, it is useful in any case.
http://cr.openjdk.java.net/~goetz/wr20/8230402-leaking_tasks-jdk11/01/

Please review.

https://bugs.openjdk.java.net/browse/JDK-8230402
https://hg.openjdk.java.net/jdk/jdk/rev/2ca886fd1d52

Best regards,
  Goetz.