Fix -Wsign-compare warnings in parser, scanner, regexp, runtime.

src/uri.cc

 // Copyright 2016 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.
 
 #include "src/uri.h"
 
 #include "src/char-predicates-inl.h"
 #include "src/handles.h"
 #include "src/isolate-inl.h"
 #include "src/list.h"
@@ skipping 33 matching lines @@
 }
 
 bool DecodeOctets(const uint8_t* octets, int length, List<uc16>* buffer) {
   size_t cursor = 0;
   uc32 value = unibrow::Utf8::ValueOf(octets, length, &cursor);
   if (value == unibrow::Utf8::kBadChar &&
       !IsReplacementCharacter(octets, length)) {
     return false;
   }
 
-  if (value <= unibrow::Utf16::kMaxNonSurrogateCharCode) {
+  if (value <= static_cast<uc32>(unibrow::Utf16::kMaxNonSurrogateCharCode)) {
     buffer->Add(value);
   } else {
     buffer->Add(unibrow::Utf16::LeadSurrogate(value));
     buffer->Add(unibrow::Utf16::TrailSurrogate(value));
   }
   return true;
 }
 
 int TwoDigitHex(uc16 character1, uc16 character2) {
   if (character1 > 'f') return -1;
@@ skipping 431 matching lines @@
 MaybeHandle<String> Uri::Unescape(Isolate* isolate, Handle<String> string) {
   Handle<String> result;
   string = String::Flatten(string);
   return string->IsOneByteRepresentationUnderneath()
              ? UnescapePrivate<uint8_t>(isolate, string)
              : UnescapePrivate<uc16>(isolate, string);
 }
 
 }  // namespace internal
 }  // namespace v8