TestParallelHeapSizeFlags fails with unexpected heap size

Running the test on sparcv9 fails with this exception:
java.lang.RuntimeException: Heap has 8388608 bytes, expected to be less than 4194304
at TestMaxHeapSizeTools.checkGenMaxHeapSize(TestMaxHeapSizeTools.java:254)
at TestMaxHeapSizeTools.checkGenMaxHeapErgo(TestMaxHeapSizeTools.java:109)
at TestParallelHeapSizeFlags.main(TestParallelHeapSizeFlags.java:46)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:483)
at com.sun.javatest.regtest.MainWrapper$MainThread.run(MainWrapper.java:94)
at java.lang.Thread.run(Thread.java:744)