[stubs]: Support 1->2 byte copies in CopyStringCharacters

src/zone/zone.h

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef V8_ZONE_ZONE_H_
 #define V8_ZONE_ZONE_H_
 
 #include <limits>
 
 #include "src/base/hashmap.h"
@@ skipping 142 matching lines @@
 // Zone. ZoneLists cannot be deleted individually; you can delete all
 // objects in the Zone by calling Zone::DeleteAll().
 template <typename T>
 class ZoneList final : public List<T, ZoneAllocationPolicy> {
  public:
   // Construct a new ZoneList with the given capacity; the length is
   // always zero. The capacity must be non-negative.
   ZoneList(int capacity, Zone* zone)
       : List<T, ZoneAllocationPolicy>(capacity, ZoneAllocationPolicy(zone)) {}
 
+  // Construct a new ZoneList from a std::initializer_list
+  ZoneList(std::initializer_list<T> list, Zone* zone)
+      : List<T, ZoneAllocationPolicy>(static_cast<int>(list.size()),
+                                      ZoneAllocationPolicy(zone)) {
+    for (auto& i : list) Add(i, zone);
+  }
+
   void* operator new(size_t size, Zone* zone) { return zone->New(size); }
 
   // Construct a new ZoneList by copying the elements of the given ZoneList.
   ZoneList(const ZoneList<T>& other, Zone* zone)
       : List<T, ZoneAllocationPolicy>(other.length(),
                                       ZoneAllocationPolicy(zone)) {
     AddAll(other, zone);
   }
 
   // We add some convenience wrappers so that we can pass in a Zone
@@ skipping 50 matching lines @@
 
 typedef base::PointerTemplateHashMapImpl<ZoneAllocationPolicy> ZoneHashMap;
 
 typedef base::CustomMatcherTemplateHashMapImpl<ZoneAllocationPolicy>
     CustomMatcherZoneHashMap;
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_ZONE_ZONE_H_