[cling][NFC] Add GCC fallthrough comment, 80cols.
[cling][NFC] Add GCC fallthrough comment, 80cols.

root-mirror/root,root-mirror/root,karies/root,olifre/root,root-mirror/root,karies/root,karies/root,karies/root,olifre/root,root-mirror/root,karies/root,olifre/root,olifre/root,olifre/root,olifre/root,root-mirror/root,karies/root,root-mirror/root,root-mirror/root,olifre/root,olifre/root,root-mirror/root,karies/root,karies/root,root-mirror/root,root-mirror/root,karies/root,karies/root,root-mirror/root,karies/root,olifre/root,olifre/root,olifre/root