CFI: fix a bad cast from icu_54::Quantifier to icu_54::UnicodeSet.

source/i18n/rbt_pars.cpp

 /*
  **********************************************************************
  *   Copyright (C) 1999-2011, International Business Machines
  *   Corporation and others.  All Rights Reserved.
  **********************************************************************
  *   Date        Name        Description
  *   11/17/99    aliu        Creation.
  **********************************************************************
  */
 
@@ skipping 1084 matching lines @@
                 // NULL pointer check
                 if (data->variables == NULL) {
                     status = U_MEMORY_ALLOCATION_ERROR;
                     return;
                 }
                 data->variablesAreOwned = (i == 0);
             }
 
             for (int32_t j = 0; j < data->variablesLength; j++) {
                 data->variables[j] =
-                    ((UnicodeSet*)variablesVector.elementAt(j));
+                    ((UnicodeFunctor*)variablesVector.elementAt(j));
             }
             
             data->variableNames.removeAll();
             int32_t pos = -1;
             const UHashElement* he = variableNames.nextElement(pos);
             while (he != NULL) {
                 UnicodeString* tempus = (UnicodeString*)(((UnicodeString*)(he->value.pointer))->clone());
                 if (tempus == NULL) {
                     status = U_MEMORY_ALLOCATION_ERROR;
                     return;
@@ skipping 613 matching lines @@
         U16_APPEND_UNSAFE(target, index, c);
         target+=index;
     }
     if (target < targetLimit) {
         *target = 0;
     }
     return (int32_t)(target-targetStart);
 }
 
 #endif /* #if !UCONFIG_NO_TRANSLITERATION */