In the following files:

src/mongo/db/commands/kill_operations_command.cpp
src/mongo/db/exec/return_key.cpp
src/mongo/util/concurrency/thread_pool.cpp
src/mongo/db/service_entry_point_common.cpp
src/mongo/db/exec/working_set_common.cpp
src/mongo/db/query/stage_builder.cpp
src/mongo/transport/session_asio.h
src/mongo/db/db.cpp