RFR(T) 8224017: [Graal] gc/z/TestUncommit.java fails with Graal

[Ekaterina Pavlova]

Hi,

please review one more trivial change which disables recently added gc/z/TestUncommit.java from running
in Graal as JIT mode. Cleaned up tests which fail due to 8196611 in test/hotspot/jtreg/ProblemList-graal.txt as well.

    JBS: https://bugs.openjdk.java.net/browse/JDK-8224017
webrev: http://cr.openjdk.java.net/~epavlova//8224017/webrev.00/index.html

thanks,
-katya