Fix a bunch of implicit casts detected by the Win64 compiler

src/d8.cc

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 266 matching lines @@
     if (source.IsEmpty()) {
       return ThrowException(String::New("Error loading file"));
     }
     if (!ExecuteString(source, String::New(*file), false, true)) {
       return ThrowException(String::New("Error executing file"));
     }
   }
   return Undefined();
 }
 
-static size_t convertToUint(Local<Value> value_in, TryCatch* try_catch) {
-  if (value_in->IsUint32()) {
-    return value_in->Uint32Value();
+static int32_t convertToUint(Local<Value> value_in, TryCatch* try_catch) {
+  if (value_in->IsInt32()) {
+    return value_in->Int32Value();
   }
 
   Local<Value> number = value_in->ToNumber();
   if (try_catch->HasCaught()) return 0;
 
   ASSERT(number->IsNumber());
   Local<Int32> int32 = number->ToInt32();
   if (try_catch->HasCaught() || int32.IsEmpty()) return 0;
 
   int32_t raw_value = int32->Int32Value();
   if (try_catch->HasCaught()) return 0;
 
   if (raw_value < 0) {
     ThrowException(String::New("Array length must not be negative."));
     return 0;
   }
 
   static const int kMaxLength = 0x3fffffff;
 #ifndef V8_SHARED
   ASSERT(kMaxLength == i::ExternalArray::kMaxLength);
 #endif  // V8_SHARED
   if (raw_value > static_cast<int32_t>(kMaxLength)) {
     ThrowException(
         String::New("Array length exceeds maximum length."));
   }
-  return static_cast<size_t>(raw_value);
+  return raw_value;
 }
 
 
 const char kArrayBufferMarkerPropName[] = "d8::_is_array_buffer_";
 
 
 Handle<Value> Shell::CreateExternalArrayBuffer(int32_t length) {
   static const int32_t kMaxSize = 0x7fffffff;
   // Make sure the total size fits into a (signed) int.
   if (length < 0 || length > kMaxSize) {
@@ skipping 1216 matching lines @@
 }
 
 }  // namespace v8
 
 
 #ifndef GOOGLE3
 int main(int argc, char* argv[]) {
   return v8::Shell::Main(argc, argv);
 }
 #endif