use the cached callable when reading the signature, so we get the final code object

Author: timfel

graalpython/com.oracle.graal.python/src/com/oracle/graal/python/nodes/argument/CreateArgumentsNode.java

@@ -165,8 +165,7 @@ Object[] doFunctionCached(PFunction callable, Object[] userArguments, PKeyword[]
                     @Cached CreateAndCheckArgumentsNode createAndCheckArgumentsNode,
                     @Cached InlinedBranchProfile firstExecution,
                     @Cached(value = "callable", weak = true) @SuppressWarnings("unused") PFunction cachedCallable) {
-
-        Signature signature = CodeNodes.GetCodeSignatureNode.getInSingleContextMode(inliningTarget, callable, firstExecution);
+        Signature signature = CodeNodes.GetCodeSignatureNode.getInSingleContextMode(inliningTarget, cachedCallable, firstExecution);
         Object[] defaults = cachedCallable.getDefaults();
         PKeyword[] kwdefaults = cachedCallable.getKwDefaults();
         return createAndCheckArgumentsNode.execute(inliningTarget, callable, userArguments, keywords, signature, null, null, defaults, kwdefaults, false);