tests/readlink.py

fsmonitor: use nonnormalset from dirstatemap

`dirstate._nonnormalset` has been moved to `dirstate._map.nonnormalset` by
60927b19ed65 (dirstate: move nonnormal and otherparent sets to dirstatemap)
and is guaranteed to be existed.

Let's update fsmonitor code to use the new `nonnormalset`. Thix fixed a perf
regression that slows down `hg status` by 0.5 seconds in one of our
production repos.

Differential Revision: https://phab.mercurial-scm.org/D1184

#!/usr/bin/env python

from __future__ import absolute_import, print_function

import errno
import os
import sys

for f in sys.argv[1:]:
    try:
        print(f, '->', os.readlink(f))
    except OSError as err:
        if err.errno != errno.EINVAL:
            raise
        print(f, '->', f, 'not a symlink')

sys.exit(0)