Support non-internalized string key lookups in Hydrogen KeyedLoadIC

src/runtime.cc

Index: src/runtime.cc
diff --git a/src/runtime.cc b/src/runtime.cc
index e1540477f5386d11e8d3e1533dc209f1d1656e17..8728a0559b3d25c9a44fd156949e68edb3d93d7f 100644
--- a/src/runtime.cc
+++ b/src/runtime.cc
@@ -4476,6 +4476,14 @@ RUNTIME_FUNCTION(Runtime_SubString) {
 }
 
 
+RUNTIME_FUNCTION(Runtime_InternalizeString) {
+  HandleScope handles(isolate);
+  RUNTIME_ASSERT(args.length() == 1);
+  CONVERT_ARG_HANDLE_CHECKED(String, string, 0);
+  return *isolate->factory()->InternalizeString(string);
+}
+
+
 RUNTIME_FUNCTION(Runtime_StringMatch) {
   HandleScope handles(isolate);
   ASSERT(args.length() == 3);