Add non-ASCII support to d8's read() function

src/d8.cc

Index: src/d8.cc
diff --git a/src/d8.cc b/src/d8.cc
index 5361869a7e2a6ee13de740f666fafa5f6c00db1d..cbf2dafc2dbab922ef112cc144d0889c0bbb0320 100644
--- a/src/d8.cc
+++ b/src/d8.cc
@@ -1485,7 +1485,7 @@ Handle<String> Shell::ReadFile(Isolate* isolate, const char* name) {
   int size = 0;
   char* chars = ReadChars(isolate, name, &size);
   if (chars == NULL) return Handle<String>();
-  Handle<String> result = String::New(chars);
+  Handle<String> result = String::New(chars, size);
   delete[] chars;
   return result;
 }