[parser, serializer] Fix more -Wsign-compare warnings.

src/unicode.cc

 // Copyright 2012 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.
 //
 // This file was generated at 2014-10-08 15:25:47.940335
 
 #include "src/unicode.h"
 #include "src/unicode-inl.h"
 #include <stdio.h>
 #include <stdlib.h>
@@ skipping 328 matching lines @@
     uchar previous = *buffer;
     *buffer = 0;
     uchar t = ValueOfIncremental(previous, buffer);
     if (t == kIncomplete) {
       // If we have an incomplete character, process both the previous and the
       // next byte at once.
       return ValueOfIncremental(next, buffer);
     } else {
       // Otherwise, process the previous byte and save the next byte for next
       // time.
-      DCHECK_EQ(0, *buffer);
+      DCHECK_EQ(0u, *buffer);
       *buffer = next;
       return t;
     }
   } else if (IsContinuationCharacter(next)) {
     // We're inside of a character, as described by buffer.
 
     // How many bytes (excluding this one) do we still expect?
     uint8_t count = (*buffer >> 24) - 1;
     // Update the value.
     uint32_t value = ((*buffer & 0xffffff) << 6) | (next & 0x3F);
@@ skipping 3166 matching lines @@
              sizeof(MultiCharacterSpecialCase<1>)  // NOLINT
          +
          kCanonicalizationRangeMultiStrings1Size *
              sizeof(MultiCharacterSpecialCase<1>)  // NOLINT
          +
          kCanonicalizationRangeMultiStrings7Size *
              sizeof(MultiCharacterSpecialCase<1>);  // NOLINT
 }
 
 }  // namespace unibrow