node.h: Remove obsolete comment

* node.h: NODE_FL_CREF_PUSHED_BY_EVAL was defined as
  NODE_FL_NEWLINE by r25984, redefined by r40703
  and removed by r49897.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@60627 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

node.h

@@ -252,7 +252,7 @@ typedef struct RNode {
 #define RNODE(obj)  (R_CAST(RNode)(obj))
 
 /* FL     : 0..4: T_TYPES, 5: KEEP_WB, 6: PROMOTED, 7: FINALIZE, 8: TAINT, 9: UNTRUSTED, 10: EXIVAR, 11: FREEZE */
-/* NODE_FL: 0..4: T_TYPES, 5: KEEP_WB, 6: PROMOTED, 7: NODE_FL_NEWLINE|NODE_FL_CREF_PUSHED_BY_EVAL,
+/* NODE_FL: 0..4: T_TYPES, 5: KEEP_WB, 6: PROMOTED, 7: NODE_FL_NEWLINE,
  *          8..14: nd_type,
  *          15..: nd_line
  */