Allocation site support for monomorphic StringAdds in BinaryOps.

src/objects.h

Index: src/objects.h
diff --git a/src/objects.h b/src/objects.h
index cc77e1977d3f54f3be1f97f7e15900b6e5c074ac..bed9edce17cfa2be5beeedcadbd9f23ba918c4b4 100644
--- a/src/objects.h
+++ b/src/objects.h
@@ -1106,6 +1106,7 @@ class MaybeObject BASE_EMBEDDED {
   V(kEval, "eval")                                                            \
   V(kExpected0AsASmiSentinel, "Expected 0 as a Smi sentinel")                 \
   V(kExpectedAlignmentMarker, "expected alignment marker")                    \
+  V(kExpectedAllocationSite, "expected allocation site")                      \
   V(kExpectedAllocationSiteInCell,                                            \
     "Expected AllocationSite in property cell")                               \
   V(kExpectedPropertyCellInRegisterA2,                                        \
@@ -5234,6 +5235,9 @@ class Code: public HeapObject {
   Object* FindNthObject(int n, Map* match_map);
   void ReplaceNthObject(int n, Map* match_map, Object* replace_with);
 
+  // Find the first allocation site in an IC stub.
+  AllocationSite* FindFirstAllocationSite();
+
   // Find the first map in an IC stub.
   Map* FindFirstMap();
   void FindAllMaps(MapHandleList* maps);