Optimize add/set/delete operations for string keys in Maps and Sets

src/hydrogen-instructions.h

Index: src/hydrogen-instructions.h
diff --git a/src/hydrogen-instructions.h b/src/hydrogen-instructions.h
index b56e9215ab35d5d4c22b11f8eab3af9128fc6e58..22c6935fe9a4a5415d27a231210dd0caaea50b4b 100644
--- a/src/hydrogen-instructions.h
+++ b/src/hydrogen-instructions.h
@@ -6356,6 +6356,13 @@ class HObjectAccess FINAL {
                          Representation::Smi());
   }
 
+  template <typename CollectionType>
+  static HObjectAccess ForOrderedHashTableNumberOfDeletedElements() {
+    return HObjectAccess(kInobject,
+                         CollectionType::kNumberOfDeletedElementsOffset,
+                         Representation::Smi());
+  }
+
   inline bool Equals(HObjectAccess that) const {
     return value_ == that.value_;  // portion and offset must match
   }