Update re2

third_party/re2/re2/unicode_casefold.h

 // Copyright 2008 The RE2 Authors.  All Rights Reserved.
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
 // Unicode case folding tables.
 
 // The Unicode case folding tables encode the mapping from one Unicode point
 // to the next largest Unicode point with equivalent folding.  The largest
 // point wraps back to the first.  For example, the tables map:
 //
@@ skipping 33 matching lines @@
 namespace re2 {
 
 enum {
   EvenOdd = 1,
   OddEven = -1,
   EvenOddSkip = 1<<30,
   OddEvenSkip,
 };
 
 struct CaseFold {
-  uint32 lo;
-  uint32 hi;
+  Rune lo;
+  Rune hi;
   int32 delta;
 };
 
-extern CaseFold unicode_casefold[];
-extern int num_unicode_casefold;
+extern const CaseFold unicode_casefold[];
+extern const int num_unicode_casefold;
 
-extern CaseFold unicode_tolower[];
-extern int num_unicode_tolower;
+extern const CaseFold unicode_tolower[];
+extern const int num_unicode_tolower;
 
 // Returns the CaseFold* in the tables that contains rune.
 // If rune is not in the tables, returns the first CaseFold* after rune.
 // If rune is larger than any value in the tables, returns NULL.
-extern CaseFold* LookupCaseFold(CaseFold*, int, Rune rune);
+extern const CaseFold* LookupCaseFold(const CaseFold*, int, Rune rune);
 
 // Returns the result of applying the fold f to the rune r.
-extern Rune ApplyFold(CaseFold *f, Rune r);
+extern Rune ApplyFold(const CaseFold *f, Rune r);
 
 }  // namespace re2
 
 #endif  // RE2_UNICODE_CASEFOLD_H__