8161660: Quarantine TestParallelHeapSizeFlags.java and TestSmallHeap.java

Quarantine test.

Reviewed-by: dholmes, thartmann

hotspot/test/gc/TestSmallHeap.java

@@ -27,6 +27,7 @@
  * @requires vm.gc=="null"
  * @summary Verify that starting the VM with a small heap works
  * @library /testlibrary /test/lib /test/lib/share/classes
+ * @ignore 8161552
  * @modules java.base/jdk.internal.misc
  * @modules java.management/sun.management
  * @build TestSmallHeap

hotspot/test/gc/arguments/TestParallelHeapSizeFlags.java

@@ -29,6 +29,7 @@
  * parallel collectors.
  * @requires vm.gc=="null"
  * @library /testlibrary /test/lib
+ * @ignore 8161552
  * @modules java.base/jdk.internal.misc
  *          java.management
  * @build TestParallelHeapSizeFlags TestMaxHeapSizeTools