Increase library limit for LenNode

Author: qunaibit

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

@@ -1311,7 +1311,7 @@ public Object iter(Object callable, Object sentinel) {
     @GenerateNodeFactory
     @ReportPolymorphism
     public abstract static class LenNode extends PythonUnaryBuiltinNode {
-        @Specialization(limit = "getCallSiteInlineCacheMaxDepth()")
+        @Specialization(limit = "6")
         public int len(VirtualFrame frame, Object obj,
                         @CachedLibrary("obj") PythonObjectLibrary lib) {
             return lib.lengthWithFrame(obj, frame);