fix warning

Author: timfel

graalpython/com.oracle.graal.python/src/com/oracle/graal/python/builtins/modules/BuiltinConstructors.java

@@ -1485,7 +1485,7 @@ Object doObjectDirect(@SuppressWarnings("unused") PythonManagedClass self, Objec
         @Specialization(limit = "getCallSiteInlineCacheMaxDepth()", //
                         guards = {"getInstanceShape(self) == cachedInstanceShape", "!self.needsNativeAllocation()"}, //
                         replaces = "doObjectDirect")
-        Object doObjectCachedInstanceShape(PythonManagedClass self, Object[] varargs, PKeyword[] kwargs,
+        Object doObjectCachedInstanceShape(@SuppressWarnings("unused") PythonManagedClass self, Object[] varargs, PKeyword[] kwargs,
                         @Cached("getInstanceShape(self)") Shape cachedInstanceShape) {
             if (varargs.length > 0 || kwargs.length > 0) {
                 // TODO: tfel: this should throw an error only if init isn't overridden