PlaceholderType  2226 third_party/protobuf/src/google/protobuf/descriptor.cc                       PlaceholderType placeholder_type = PLACEHOLDER_MESSAGE,
PlaceholderType  2237 third_party/protobuf/src/google/protobuf/descriptor.cc   Symbol NewPlaceholder(const string& name, PlaceholderType placeholder_type);
PlaceholderType  2725 third_party/protobuf/src/google/protobuf/descriptor.cc     PlaceholderType placeholder_type, ResolveMode resolve_mode) {
PlaceholderType  2737 third_party/protobuf/src/google/protobuf/descriptor.cc                                          PlaceholderType placeholder_type) {