[lworld] GCBasher doesn't understand primitive types

The TestGCBasherXxx suite doesn't understand the opcodes for primitive classes (defaultvalue, withfield), and so needs tweaking once primitive classes enter into the JDK.

STDERR:
java.lang.IllegalArgumentException: Unknown bytecode 203
at gc.stress.gcbasher.Bytecode.getLength(Bytecode.java:254)
at gc.stress.gcbasher.Decompiler.decodeMethodDependencies(Decompiler.java:174)
at gc.stress.gcbasher.Decompiler.<init>(Decompiler.java:60)
at gc.stress.gcbasher.TestGCBasher.parseClassFiles(TestGCBasher.java:46)
at gc.stress.gcbasher.TestGCBasher.main(TestGCBasher.java:63)
at gc.stress.gcbasher.TestGCBasherWithG1.main(TestGCBasherWithG1.java:40)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:77)
at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.base/java.lang.reflect.Method.invoke(Method.java:569)
at com.sun.javatest.regtest.agent.MainWrapper$MainThread.run(MainWrapper.java:127)
at java.base/java.lang.Thread.run(Thread.java:833)