GR-20806: treat the lambda case

- still missing treating free vars

Author: cosminbasca

graalpython/com.oracle.graal.python.test/src/tests/test_code.py

@@ -182,4 +182,5 @@ def foo():
         pass
 
     ct = type(foo.__code__)
+    del foo
     ct(2, 0, 0, 128, 0, b"lambda a,b: a+b", tuple(), ("a", "b"), tuple(), "hello.py", "<lambda>", 0, b"", tuple(), tuple())

graalpython/com.oracle.graal.python/src/com/oracle/graal/python/builtins/objects/code/CodeNodes.java

@@ -137,8 +137,10 @@ private PCode createCode(LazyPythonClass cls, int argcount, int kwonlyargcount,
                     Object[] args = PArguments.create();
                     PDict globals = factory.createDict();
                     PArguments.setGlobals(args, globals);
-                    InvokeNode.invokeUncached(Truffle.getRuntime().createCallTarget(rootNode), args);
-                    Object function = ensureGetItemNode().execute(null, globals.getDictStorage(), name);
+                    Object function = InvokeNode.invokeUncached(Truffle.getRuntime().createCallTarget(rootNode), args);
+                    if (function == PNone.NONE) {
+                        function = ensureGetItemNode().execute(null, globals.getDictStorage(), name);
+                    }
                     if (function instanceof PFunction) {
                         rootNode = ((PFunction) function).getFunctionRootNode();
                     } else {