Reland r20960: "HashTable::EnsureCapacity() handlified."

src/objects.h

Index: src/objects.h
diff --git a/src/objects.h b/src/objects.h
index d926165c3e06e358ff595567f5ba58a175286743..3d55106bab164a0270e9870ff0feaf743c78ddb2 100644
--- a/src/objects.h
+++ b/src/objects.h
@@ -3736,7 +3736,7 @@ class HashTable: public FixedArray {
       PretenureFlag pretenure = NOT_TENURED);
 
   // Returns a new HashTable object.
-  static Handle<Derived> New(
+  MUST_USE_RESULT static Handle<Derived> New(
       Isolate* isolate,
       int at_least_space_for,
       MinimumCapacity capacity_option = USE_DEFAULT_MINIMUM_CAPACITY,
@@ -3843,29 +3843,26 @@ class HashTable: public FixedArray {
     return (last + number) & (size - 1);
   }
 
-  // Returns _expected_ if one of entries given by the first _probe_ probes is
-  // equal to  _expected_. Otherwise, returns the entry given by the probe
-  // number _probe_.
-  uint32_t EntryForProbe(Key key, Object* k, int probe, uint32_t expected);
-
-  void Swap(uint32_t entry1, uint32_t entry2, WriteBarrierMode mode);
-
-  // Rehashes this hash-table into the new table.
-  void Rehash(Derived* new_table, Key key);
-
   // Attempt to shrink hash table after removal of key.
   static Handle<Derived> Shrink(Handle<Derived> table, Key key);
 
   // Ensure enough space for n additional elements.
-  MUST_USE_RESULT MaybeObject* EnsureCapacity(
-      int n,
-      Key key,
-      PretenureFlag pretenure = NOT_TENURED);
-  static Handle<Derived> EnsureCapacity(
+  MUST_USE_RESULT static Handle<Derived> EnsureCapacity(
       Handle<Derived> table,
       int n,
       Key key,
       PretenureFlag pretenure = NOT_TENURED);
+
+ private:
+  // Returns _expected_ if one of entries given by the first _probe_ probes is
+  // equal to  _expected_. Otherwise, returns the entry given by the probe
+  // number _probe_.
+  uint32_t EntryForProbe(Key key, Object* k, int probe, uint32_t expected);
+
+  void Swap(uint32_t entry1, uint32_t entry2, WriteBarrierMode mode);
+
+  // Rehashes this hash-table into the new table.
+  void Rehash(Handle<Derived> new_table, Key key);
 };