Generalize internalization of substrings.

src/factory.cc

Index: src/factory.cc
diff --git a/src/factory.cc b/src/factory.cc
index 65888acbf00d48974464a5e2872b04f078360f0a..1402f1de402eb3f706e0f2ad76c0848fe3979955 100644
--- a/src/factory.cc
+++ b/src/factory.cc
@@ -227,7 +227,7 @@ Handle<String> Factory::InternalizeOneByteString(Vector<const uint8_t> string) {
 
 Handle<String> Factory::InternalizeOneByteString(
     Handle<SeqOneByteString> string, int from, int length) {
-  SubStringOneByteStringKey key(string, from, length);
+  SubStringKey<uint8_t> key(string, from, length);
   return InternalizeStringWithKey(&key);
 }
 
@@ -246,6 +246,12 @@ Handle<String> Factory::InternalizeStringWithKey(StringTableKey* key) {
 }
 
 
+template Handle<String> Factory::InternalizeStringWithKey<
+    SubStringKey<uint8_t> > (SubStringKey<uint8_t>* key);
+template Handle<String> Factory::InternalizeStringWithKey<
+    SubStringKey<uint16_t> > (SubStringKey<uint16_t>* key);
+
+
 Handle<String> Factory::NewStringFromOneByte(Vector<const uint8_t> string,
                                              PretenureFlag pretenure) {
   CALL_HEAP_FUNCTION(