nobu	2016-11-12 15:12:12 +0900 (Sat, 12 Nov 2016)

  New Revision: 56739

  https://svn.ruby-lang.org/cgi-bin/viewvc.cgi?view=revision&revision=56739

  Log:
    class.c: trivial optimization
    
    * class.c (singleton_class_of): just copy FROZEN flag without
      conditions.

  Modified files:
    trunk/class.c
Index: class.c
===================================================================
--- class.c	(revision 56738)
+++ class.c	(revision 56739)
@@ -1619,7 +1619,7 @@ singleton_class_of(VALUE obj) https://github.com/ruby/ruby/blob/trunk/class.c#L1619
     else {
 	FL_UNSET(klass, FL_TAINT);
     }
-    if (OBJ_FROZEN(obj)) OBJ_FREEZE_RAW(klass);
+    RB_FL_SET_RAW(klass, RB_OBJ_FROZEN_RAW(obj));
 
     return klass;
 }

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