cleanup hotspot ProblemList

Resolved 231 days ago. possible hang in sun.awt.shell.Win32ShellFolder2$KnownFolderDefinition::<clinit> | https://bugs.openjdk.java.net/browse/JDK-8189604

Resolved 5 days ago. java/util/concurrent/CountDownLatch/Basic.java failed w/ Xcomp | https://bugs.openjdk.java.net/browse/JDK-8195057

Resolved 5 days ago. org.graalvm.compiler.hotspot.test.CheckGraalIntrinsics fails | https://bugs.openjdk.java.net/browse/JDK-8218698