dirstate: split the foldmap into separate ones for files and directories Computing the set of directories in the dirstate can be pretty expensive. For 'hg status' without arguments, it turns out we actually never need to figure out the right case for directories in the foldmap. (An upcoming patch explains why.) This patch splits up the directory and file maps into separate ones, allowing for the subsequent optimization in status.

dirstate: introduce function to normalize just filenames This will be used in upcoming patches to stop generating the set of directories in many common cases.