[yugabyte#6696] Leftover review comments for minor master perf tweaks

Summary: Follow up comments from D12240.

Test Plan: Jenkins

Reviewers: sergei

Reviewed By: sergei

Subscribers: ybase

Differential Revision: https://phabricator.dev.yugabyte.com/D12269

Author: bmatican

src/yb/common/ql_rowblock.cc

@@ -111,6 +111,7 @@ QLRow& QLRowBlock::Extend() {
   rows_.emplace_back(schema_);
   return rows_.back();
 }
+
 void QLRowBlock::Reserve(size_t size) {
   rows_.reserve(size);
 }

src/yb/master/master_util.cc

@@ -99,9 +99,9 @@ void TakeRegistration(consensus::RaftPeerPB* source, TSInfoPB* dest) {
 }
 
 void CopyRegistration(const consensus::RaftPeerPB& source, TSInfoPB* dest) {
-  dest->mutable_private_rpc_addresses()->CopyFrom(source.last_known_private_addr());
-  dest->mutable_broadcast_addresses()->CopyFrom(source.last_known_broadcast_addr());
-  dest->mutable_cloud_info()->CopyFrom(source.cloud_info());
+  *dest->mutable_private_rpc_addresses() = source.last_known_private_addr();
+  *dest->mutable_broadcast_addresses() = source.last_known_broadcast_addr();
+  *dest->mutable_cloud_info() = source.cloud_info();
 }
 
 void TakeRegistration(ServerRegistrationPB* source, TSInfoPB* dest) {