RFR (S): 8059651: Tests specify -XX:+UseG1GC and -XX:ParallelGCThreads=0

[Marcus Larsson]

Hi,

I would like reviews for the following patch removing two tests that are 
no longer usable since ParallelGCThreads can not be 0 for G1 [1].

Webrev:
http://cr.openjdk.java.net/~mlarsson/8059651/webrev.00/

Bug:
https://bugs.openjdk.java.net/browse/JDK-8059651

Thanks,
Marcus

[1]: https://bugs.openjdk.java.net/browse/JDK-8059527