Allocation site support for monomorphic StringAdds in BinaryOps.

src/objects.cc

Index: src/objects.cc
diff --git a/src/objects.cc b/src/objects.cc
index 43a047e78c0cd80c179a3c476c919f6251475362..c510b2889bb766dbd78066bd4a98ac774e08751d 100644
--- a/src/objects.cc
+++ b/src/objects.cc
@@ -10516,6 +10516,12 @@ Object* Code::FindNthObject(int n, Map* match_map) {
 }
 
 
+AllocationSite* Code::FindFirstAllocationSite() {
+  Object* result = FindNthObject(1, GetHeap()->allocation_site_map());
+  return (result != NULL) ? AllocationSite::cast(result) : NULL;
+}
+
+
 Map* Code::FindFirstMap() {
   Object* result = FindNthObject(1, GetHeap()->meta_map());
   return (result != NULL) ? Map::cast(result) : NULL;