Update ICU to 58.1

source/common/rbbitblb.h

Index: source/common/rbbitblb.h
diff --git a/source/common/rbbitblb.h b/source/common/rbbitblb.h
index 3805b6752a34f2214914c47b9fc7d9ee97c73918..d71a0245874b5d09610c68e5191277dd770968ce 100644
--- a/source/common/rbbitblb.h
+++ b/source/common/rbbitblb.h
@@ -1,10 +1,12 @@
+// Copyright (C) 2016 and later: Unicode, Inc. and others.
+// License & terms of use: http://www.unicode.org/copyright.html
 //
 //  rbbitblb.h
 //
 
 /*
 **********************************************************************
-*   Copyright (c) 2002-2005, International Business Machines
+*   Copyright (c) 2002-2016, International Business Machines
 *   Corporation and others.  All Rights Reserved.
 **********************************************************************
 */
@@ -58,6 +60,8 @@ private:
     void     flagTaggedStates();
     void     mergeRuleStatusVals();
 
+    void     addRuleRootNodes(UVector *dest, RBBINode *node);
+
     // Set functions for UVector.
     //   TODO:  make a USet subclass of UVector