Also support smi in load-ICs.

src/objects.cc

Index: src/objects.cc
diff --git a/src/objects.cc b/src/objects.cc
index 8308146052e5361cea0fd11438d15079c6963ef7..651ad6f378721cf9c1bbb260abbba2a18b94751f 100644
--- a/src/objects.cc
+++ b/src/objects.cc
@@ -1028,6 +1028,12 @@ Object* Object::GetPrototype(Isolate* isolate) {
 }
 
 
+Map* Object::GetMarkerMap(Isolate* isolate) {
+  if (IsSmi()) return isolate->heap()->heap_number_map();
+  return HeapObject::cast(this)->map();
+}
+
+
 Object* Object::GetHash() {
   // The object is either a number, a name, an odd-ball,
   // a real JS object, or a Harmony proxy.