remove: use ctx.hasdir(f) instead of 'f in ctx.dirs()'...
remove: use ctx.hasdir(f) instead of 'f in ctx.dirs()'
This speeds up 'hg remove python/README' on the Firefox repo from
2.479s to 0.664s with lazily loaded treemanifests (which is not yet in
core) and has no measurable effect on flat manifests.