revision.c: --reflog add HEAD reflog from all worktrees

Note that add_other_reflogs_to_pending() is a bit inefficient, since
it scans reflog for all refs of each worktree, including shared refs,
so the shared ref's reflog is scanned over and over again.

We could update refs API to pass "per-worktree only" flag to avoid
that. But long term we should be able to obtain a "per-worktree only"
ref store and would need to revert the changes in reflog iteration
API. So let's just wait until then.

add_reflogs_to_pending() is called by reachable.c so by default "git
prune" will examine reflog from all worktrees.

Signed-off-by: Nguyễn Thái Ngọc Duy <pclouds@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

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