Enable interop to use untyped Java collections.

This provides a way to treat some 6model object as a plain old Java
object for a while, then later on recover the underlying 6model
object once again. This is useful when wanting to use some of the
built-in Java collection classes.

Author: jnthn

src/vm/jvm/runtime/org/perl6/nqp/runtime/BootJavaInterop.java

@@ -177,6 +177,15 @@ public SixModelObject implementClass(SixModelObject description) {
         finishClass(cc);
         return RuntimeSupport.boxJava(cc.constructed, getSTableForClass(Class.class));
     }
+    
+    /** Hiding arbitrary 6model objects under Object, for working with
+      * untyped collection classes, etc. */
+    public SixModelObject sixmodelToJavaObject(SixModelObject smo) {
+        return RuntimeSupport.boxJava(smo, getSTableForClass(Object.class));
+    }
+    public SixModelObject javaObjectToSixmodel(SixModelObject javaObj) {
+        return (SixModelObject)RuntimeSupport.unboxJava(javaObj);
+    }
 
     protected void finishClass(ClassContext cc) {
         cc.cv.visitEnd();