ensure singleton ptrs are singletons

Author: timfel

graalpython/com.oracle.graal.python/src/com/oracle/graal/python/PythonLanguage.java

@@ -119,7 +119,7 @@ public final class PythonLanguage extends TruffleLanguage<PythonContext> {
     private final NodeFactory nodeFactory;
     public final ConcurrentHashMap<Class<? extends PythonBuiltinBaseNode>, RootCallTarget> builtinCallTargetCache = new ConcurrentHashMap<>();
 
-    private static final Object[] CONTEXT_INSENSITIVE_SINGLETONS = new Object[]{PNone.NONE, PNone.NO_VALUE, PEllipsis.INSTANCE, PNotImplemented.NOT_IMPLEMENTED};
+    @CompilationFinal(dimensions = 1) private static final Object[] CONTEXT_INSENSITIVE_SINGLETONS = new Object[]{PNone.NONE, PNone.NO_VALUE, PEllipsis.INSTANCE, PNotImplemented.NOT_IMPLEMENTED};
 
     /*
      * We need to store this here, because the check is on the language and can come from a thread