Revert of [regexp] implement /ui to mirror the implementation for /i.

src/unicode.h

 // Copyright 2011 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef V8_UNICODE_H_
 #define V8_UNICODE_H_
 
 #include <sys/types.h>
 #include "src/globals.h"
 #include "src/utils.h"
 /**
  * \file
  * Definitions and convenience functions for working with unicode.
  */
 
 namespace unibrow {
 
-typedef int32_t uchar;
-typedef uint8_t byte;
+typedef unsigned int uchar;
+typedef unsigned char byte;
 
 /**
  * The max length of the result of converting the case of a single
  * character.
  */
 const int kMaxMappingSize = 4;
 
 template <class T, int size = 256>
 class Predicate {
  public:
@@ skipping 93 matching lines @@
     return 0xd800 + (((char_code - 0x10000) >> 10) & 0x3ff);
   }
   static inline uint16_t TrailSurrogate(uint32_t char_code) {
     return 0xdc00 + (char_code & 0x3ff);
   }
 };
 
 
 class Utf8 {
  public:
-  static inline unsigned Length(uchar chr, int previous);
+  static inline uchar Length(uchar chr, int previous);
   static inline unsigned EncodeOneByte(char* out, uint8_t c);
   static inline unsigned Encode(char* out,
                                 uchar c,
                                 int previous,
                                 bool replace_invalid = false);
   static uchar CalculateValue(const byte* str, size_t length, size_t* cursor);
 
   // The unicode replacement character, used to signal invalid unicode
   // sequences (e.g. an orphan surrogate) when converting to a UTF-8 encoding.
   static const uchar kBadChar = 0xFFFD;
@@ skipping 68 matching lines @@
   static const int kMaxWidth = 1;
   static int Convert(uchar c,
                      uchar n,
                      uchar* result,
                      bool* allow_caching_ptr);
 };
 
 }  // namespace unibrow
 
 #endif  // V8_UNICODE_H_