promise that DirCache.v preserves MSDBlocks
promise that DirCache.v preserves MSDBlocks

this fixes [namei_ok] in DirTree.v

but perhaps the proofs in DirCache.v are now broken

mit-pdos/fscq-impl,mit-pdos/fscq-impl,mit-pdos/fscq-impl,mit-pdos/fscq-impl,mit-pdos/fscq-impl