parsers: when available, use a presized dictionary for the file foldmap
On a repo with over 300,000 files, this speeds up perffilefoldmap:
before: wall 0.178421 comb 0.180000 user 0.160000 sys 0.020000 (best of 55)
after: wall 0.164462 comb 0.160000 user 0.140000 sys 0.020000 (best of 59)
#!/bin/sh
# This scripts is used to install dependencies for
# testing Mercurial. Mainly used by Vagrant (see
# Vagrantfile for details).
export DEBIAN_FRONTEND=noninteractive
apt-get update
apt-get install -y -q python-dev unzip
# run-tests.sh is added by Vagrantfile
chmod +x run-tests.sh