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

src/runtime/runtime-regexp.cc

 // Copyright 2014 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/runtime/runtime-utils.h"
 
 #include "src/arguments.h"
 #include "src/conversions-inl.h"
 #include "src/isolate-inl.h"
 #include "src/messages.h"
@@ skipping 373 matching lines @@
 namespace {
 List<int>* GetRewoundRegexpIndicesList(Isolate* isolate) {
   List<int>* list = isolate->regexp_indices();
   list->Rewind(0);
   return list;
 }
 
 void TruncateRegexpIndicesList(Isolate* isolate) {
   // Same size as smallest zone segment, preserving behavior from the
   // runtime zone.
-  static const size_t kMaxRegexpIndicesListCapacity = 8 * KB;
+  static const int kMaxRegexpIndicesListCapacity = 8 * KB;
   if (isolate->regexp_indices()->capacity() > kMaxRegexpIndicesListCapacity) {
     isolate->regexp_indices()->Clear();  //  Throw away backing storage
   }
 }
 }  // namespace
 
 template <typename ResultSeqString>
 MUST_USE_RESULT static Object* StringReplaceGlobalAtomRegExpWithString(
     Isolate* isolate, Handle<String> subject, Handle<JSRegExp> pattern_regexp,
     Handle<String> replacement, Handle<RegExpMatchInfo> last_match_info) {
@@ skipping 1046 matching lines @@
 
 RUNTIME_FUNCTION(Runtime_IsRegExp) {
   SealHandleScope shs(isolate);
   DCHECK(args.length() == 1);
   CONVERT_ARG_CHECKED(Object, obj, 0);
   return isolate->heap()->ToBoolean(obj->IsJSRegExp());
 }
 
 }  // namespace internal
 }  // namespace v8