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localrepo: add isfilecached to check filecache-ed property is already cached

isfilecached() encapsulates internal implementation of filecache-ed
property.

"name in repo.unfiltered().__dict__" or so can't be used for this
purpose, because corresponded entry in __dict__ might be discarded by
repo.invalidate(), repo.invalidatedirstate() or so (fsmonitor does so,
for example).

This patch makes isfilecached() return not only whether filecache-ed
property is already cached, but also already cached value (or None),
in order to avoid subsequent access to cached object via "repo.NAME",
which prevents main Mercurial procedure after reposetup() from
validating cache.

Mercurial
=========

Mercurial is a fast, easy to use, distributed revision control tool
for software developers.

Basic install:

 $ make            # see install targets
 $ make install    # do a system-wide install
 $ hg debuginstall # sanity-check setup
 $ hg              # see help

Running without installing:

 $ make local      # build for inplace usage
 $ ./hg --version  # should show the latest version

See https://mercurial-scm.org/ for detailed installation
instructions, platform-specific notes, and Mercurial user information.