Update comments about PythonOptions & PE

Author: steve-s

graalpython/com.oracle.graal.python/src/com/oracle/graal/python/builtins/objects/type/TypeNodes.java

@@ -1502,7 +1502,7 @@ public static GetInstanceShape create() {
     @GenerateUncached
     @ImportStatic(PythonOptions.class)
     public abstract static class GetItemsizeNode extends Node {
-        // We cannot easily use PythonOptions here (used on fast-path)
+        // We avoid PythonOptions here because it would require language reference
         static final int MAX_RECURSION_DEPTH = 4;
 
         public final long execute(Object cls) {

graalpython/com.oracle.graal.python/src/com/oracle/graal/python/nodes/classes/AbstractObjectIsSubclassNode.java

@@ -62,7 +62,7 @@
 @ImportStatic(PythonOptions.class)
 @NodeInfo(shortName = "cpython://Objects/abstract.c/abstract_issubclass")
 public abstract class AbstractObjectIsSubclassNode extends PNodeWithContext {
-    static final int MAX_RECURSION = 3; // Cannot use PythonOptions on fast-path
+    static final int MAX_RECURSION = 3; // Don't use PythonOptions to avoid language reference
 
     public static AbstractObjectIsSubclassNode create() {
         return AbstractObjectIsSubclassNodeGen.create();