Also support smi in load-ICs.

src/objects.cc

Index: src/objects.cc
diff --git a/src/objects.cc b/src/objects.cc
index 935e875f5105bf28dd371baa224c89823db689b4..0f716a15f90b44b6d9f50882814ca3d7067c3e75 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.