dirstate._normalize: don't construct dirfoldmap if not necessary
Constructing the dirfoldmap is expensive, so if there's a hit in the
filefoldmap, don't construct the directory foldmap.
This helps with cases like 'hg add foo' where foo is already tracked: for a
large repository, the operation goes from 1.5 seconds to 1.2 (which is still
way too much, but that's a matter for another day.)
fixbundle() {
grep -v 'saving bundle' | grep -v 'saved backup' | \
grep -v added | grep -v adding | \
grep -v "unable to find 'e' for patching" | \
grep -v "e: No such file or directory"
}