Fix: store args to artificial PFrame.

Author: fangerer

graalpython/com.oracle.graal.python/src/com/oracle/graal/python/builtins/objects/frame/PFrame.java

@@ -181,6 +181,7 @@ public PFrame(@SuppressWarnings("unused") Object threadState, PCode code, Python
         this.location = code.getRootNode();
         this.inClassScope = code.getRootNode() instanceof ClassBodyRootNode;
         this.line = code.getRootNode() == null ? code.getFirstLineNo() : -2;
+        this.arguments = frameArgs;
 
         localsDict = locals;
     }