merge-ort assertion failure

[Taylor Blau <me@ttaylorr.com>]

Elijah,

A colleague reported that they were able to hit an assertion failure in
merge-ort when rebasing a topic of their back onto upstream.

The scenario (which I have been able to reproduce on a private
repository, but haven't had time to reduce further) is:

    $ git --version
    git version 2.34.1

    $ git rebase origin/master
    warning: skipped previously applied commit 9cda243afc2a
    warning: skipped previously applied commit 882bb87a3a7c
    hint: use --reapply-cherry-picks to include skipped commits
    hint: Disable this message with "git config advice.skippedCherryPicks false"
    [some "Auto-merging" messages ...]
    CONFLICT (content): Merge conflict in
    [some file]
    warning: exhaustive rename detection was skipped due to too many files.
    warning: you may want to set your merge.renamelimit variable to at least 165 and retry the command.
    Assertion failed: (renames->cached_pairs_valid_side == 0), function
    clear_or_reinit_internal_opts, file merge-ort.c, line 546.
    Abort trap: 6

Their merge.renameLimit is set pretty low at just "1", and this
assertion goes away so long as `merge.renameLimit` is set sufficiently
high.

I haven't had a chance to look into it very deeply yet. Elijah: I figure
that this is the sort of thing that may be totally obvious to you, so
I'm sharing it here in case it is.

Otherwise, I'll continue to poke at it locally and see if I can learn
anything else.

Thanks,
Taylor