Add InternalVisibility arena enabled constructors to MapField

PiperOrigin-RevId: 556958943

src/google/protobuf/map_field.h

@@ -41,6 +41,7 @@
 #include "google/protobuf/descriptor.h"
 #include "google/protobuf/generated_message_reflection.h"
 #include "google/protobuf/generated_message_util.h"
+#include "google/protobuf/internal_visibility.h"
 #include "google/protobuf/map_entry.h"
 #include "google/protobuf/map_field_lite.h"
 #include "google/protobuf/map_type_handler.h"
@@ -618,6 +619,13 @@ class MapField final : public TypeDefinedMapFieldBase<Key, T> {
   explicit MapField(Arena* arena) : TypeDefinedMapFieldBase<Key, T>(arena) {}
   MapField(ArenaInitialized, Arena* arena) : MapField(arena) {}
 
+  MapField(InternalVisibility, Arena* arena)
+      : TypeDefinedMapFieldBase<Key, T>(arena) {}
+  MapField(InternalVisibility, Arena* arena, const MapField& from)
+      : TypeDefinedMapFieldBase<Key, T>(arena) {
+    TypeDefinedMapFieldBase<Key, T>::MergeFrom(from);
+  }
+
   // Used in the implementation of parsing. Caller should take the ownership iff
   // arena_ is nullptr.
   EntryType* NewEntry() const {

src/google/protobuf/map_field_lite.h

@@ -35,6 +35,7 @@
 
 #include "google/protobuf/port.h"
 #include "absl/log/absl_check.h"
+#include "google/protobuf/internal_visibility.h"
 #include "google/protobuf/io/coded_stream.h"
 #include "google/protobuf/map.h"
 #include "google/protobuf/map_entry_lite.h"
@@ -71,6 +72,12 @@ class MapFieldLite {
   explicit MapFieldLite(Arena* arena) : map_(arena) {}
   MapFieldLite(ArenaInitialized, Arena* arena) : MapFieldLite(arena) {}
 
+  MapFieldLite(InternalVisibility, Arena* arena) : map_(arena) {}
+  MapFieldLite(InternalVisibility, Arena* arena, const MapFieldLite& from)
+      : map_(arena) {
+    MergeFrom(from);
+  }
+
 #ifdef NDEBUG
   ~MapFieldLite() { map_.~Map(); }
 #else