Remove tc_table from MessageInfo.

This reduces the size of ExtensionInfo.

PiperOrigin-RevId: 968562757

src/google/protobuf/extension_set.cc

@@ -169,13 +169,8 @@ void ExtensionSet::RegisterMessageExtension(const MessageLite* extendee,
   ExtensionInfo info(extendee, number, type, is_repeated, is_packed,
                      verify_func, is_lazy);
   info.message_info = {
-      &internal::MessageGlobalsBase::FromDefaultInstance(prototype)->class_data,
-#if defined(PROTOBUF_CONSTINIT_DEFAULT_INSTANCES)
-      prototype->GetTcParseTable()
-#else
-      nullptr
-#endif
-  };
+      &internal::MessageGlobalsBase::FromDefaultInstance(prototype)
+           ->class_data};
   Register(info);
 }
 

src/google/protobuf/extension_set.h

@@ -165,13 +165,6 @@ struct ExtensionInfo {
   struct MessageInfo {
     // Never null.
     const internal::ClassData* class_data;
-    // TODO: Remove `tc_table` now that we can easily get it from
-    // `class_data`.
-    // The TcParse table used for this object. Never null. (except in platforms
-    // that don't constant initialize default instances)
-    const internal::TcParseTableBase* tc_table = nullptr;
-
-    const internal::TcParseTableBase* GetTcTable() const { return tc_table; }
   };
 
   union {

src/google/protobuf/extension_set_heavy.cc

@@ -262,7 +262,6 @@ bool DescriptorPoolExtensionFinder::Find(int number, ExtensionInfo* output) {
           << extension->full_name();
       output->message_info.class_data =
           &MessageGlobalsBase::FromDefaultInstance(prototype)->class_data;
-      output->message_info.tc_table = prototype->GetTcParseTable();
 
     } else if (extension->cpp_type() == FieldDescriptor::CPPTYPE_ENUM) {
       output->enum_validity_check.enum_data =