Another round of cleanups for http://www.dartbug.com/15922

runtime/vm/unicode.h

 // Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 #ifndef VM_UNICODE_H_
 #define VM_UNICODE_H_
 
 #include "vm/allocation.h"
 #include "vm/globals.h"
 
@@ skipping 11 matching lines @@
 
   static bool IsBmp(int32_t code_point) {
     return (code_point >= 0) && (code_point <= 0xFFFF);
   }
 
   static bool IsSupplementary(int32_t code_point) {
     return (code_point > 0xFFFF) && (code_point <= kMaxCodePoint);
   }
 
   // Returns true if the code point value is above Plane 17.
-  static bool IsOutOfRange(int32_t code_point) {
+  static bool IsOutOfRange(intptr_t code_point) {
     return (code_point < 0) || (code_point > kMaxCodePoint);
   }
 };
 
 
 class Utf8 : AllStatic {
  public:
   enum Type {
     kLatin1 = 0,  // Latin-1 code point [U+0000, U+00FF].
     kBMP,  // Basic Multilingual Plane code point [U+0000, U+FFFF].
@@ skipping 179 matching lines @@
   // Data for small code points with one mapping
   static const int16_t stage2_[];
 
   // Data for large code points or code points with both mappings.
   static const int32_t stage2_exception_[][2];
 };
 
 }  // namespace dart
 
 #endif  // VM_UNICODE_H_