[interpreter] Use hashmap for ConstantArrayBuilder's constant map

src/interpreter/constant-array-builder.h

Index: src/interpreter/constant-array-builder.h
diff --git a/src/interpreter/constant-array-builder.h b/src/interpreter/constant-array-builder.h
index 6705f1ebb938786f79a42685b4b9480a1da5f3e4..f0c4eae64ddbae70b32e6a85219242c0676efd8e 100644
--- a/src/interpreter/constant-array-builder.h
+++ b/src/interpreter/constant-array-builder.h
@@ -70,7 +70,6 @@ class ConstantArrayBuilder final BASE_EMBEDDED {
  private:
   typedef uint32_t index_t;
 
-  index_t AllocateEntry(Handle<Object> object);
   index_t AllocateIndex(Handle<Object> object);
   index_t AllocateReservedEntry(Smi* value);
 
@@ -108,9 +107,12 @@ class ConstantArrayBuilder final BASE_EMBEDDED {
   Handle<Object> the_hole_value() const { return the_hole_value_; }
 
   ConstantArraySlice* idx_slice_[3];
-  ZoneMap<Address, index_t> constants_map_;
+  base::TemplateHashMapImpl<Address, index_t, std::equal_to<Address>,
+                            ZoneAllocationPolicy>
+      constants_map_;
   ZoneMap<Smi*, index_t> smi_map_;
   ZoneVector<std::pair<Smi*, index_t>> smi_pairs_;
+  Zone* zone_;
   Handle<Object> the_hole_value_;
 };