Merge pull request #21689 from ovh/bp-reduce-bs-bl-rebuilds

os/bluestore/BlueFS: reduce bufferlist rebuilds during WAL writes

Reviewed-by: Adam C. Emerson <aemerson@redhat.com>

diff --cc src/common/buffer.cc
Simple merge

diff --cc src/include/buffer.h
Simple merge

diff --cc src/os/bluestore/BlueFS.cc
Simple merge

diff --cc src/os/bluestore/bluefs_types.cc
Simple merge