tests/test-gendoc-zh_CN.t

hg-core: make parse_dirstate return references rather than update hashmaps

Returing a vec is faster than updating a hashmap when the hashmap is not needed
like in `hg files` which just list tracked files.

Returning references avoid copying data when not needed improving performence
for large repositories.

Differential Revision: https://phab.mercurial-scm.org/D8861

#require docutils gettext

  $ $TESTDIR/check-gendoc zh_CN
  checking for parse errors