Generalize utilities to allow code templatization

src/objects.h

Index: src/objects.h
diff --git a/src/objects.h b/src/objects.h
index 417411d15524222bfb59708acd5b9a6f8589e24d..14c949b3b9e724e64c27b9e3b07de86af818af46 100644
--- a/src/objects.h
+++ b/src/objects.h
@@ -4688,6 +4688,10 @@ class Code: public HeapObject {
   // Get the safepoint entry for the given pc.
   SafepointEntry GetSafepointEntry(Address pc);
 
+  // Find an object in a stub with a specified map
+  Object* FindNthObject(int n, Map* match_map);
+  void ReplaceNthObject(int n, Map* match_map, Object* replace_with);
+
   // Find the first map in an IC stub.
   Map* FindFirstMap();
   void FindAllMaps(MapHandleList* maps);
@@ -4700,6 +4704,8 @@ class Code: public HeapObject {
   // Find the first name in an IC stub.
   Name* FindFirstName();
 
+  void ReplaceNthCell(int n, Cell* replace_with);
+
   class ExtraICStateStrictMode: public BitField<StrictModeFlag, 0, 1> {};
   class ExtraICStateKeyedAccessStoreMode:
       public BitField<KeyedAccessStoreMode, 1, 4> {};  // NOLINT