Merge branch 'sb/object-store-replace'

The effort to pass the repository in-core structure throughout the
API continues.  This round deals with the code that implements the
refs/replace/ mechanism.

* sb/object-store-replace:
  replace-object: allow lookup_replace_object to handle arbitrary repositories
  replace-object: allow do_lookup_replace_object to handle arbitrary repositories
  replace-object: allow prepare_replace_object to handle arbitrary repositories
  refs: allow for_each_replace_ref to handle arbitrary repositories
  refs: store the main ref store inside the repository struct
  replace-object: add repository argument to lookup_replace_object
  replace-object: add repository argument to do_lookup_replace_object
  replace-object: add repository argument to prepare_replace_object
  refs: add repository argument to for_each_replace_ref
  refs: add repository argument to get_main_ref_store
  replace-object: check_replace_refs is safe in multi repo environment
  replace-object: eliminate replace objects prepared flag
  object-store: move lookup_replace_object to replace-object.h
  replace-object: move replace_map to object store
  replace_object: use oidmap

diff --cc cache.h
Simple merge

diff --cc environment.c
Simple merge

diff --cc refs.c
index 10f69da2b859140e5d9bc61b395f737b2458dc6b,9b56fa9b819fa404bf0528aeb9d84de1cf618ec7..64aadd14c95274316fae2022741df91d2ec64c78
--- 1/refs.c
--- 2/refs.c
+++ b/refs.c
@@@ -13,7 -13,7 +13,8 @@@
  #include "tag.h"
  #include "submodule.h"
  #include "worktree.h"
 +#include "argv-array.h"
+ #include "repository.h"
  
  /*
   * List of all available backends

diff --cc refs.h
Simple merge

diff --cc refs/files-backend.c
Simple merge

diff --cc replace-object.c
Simple merge

diff --cc repository.h
Simple merge

diff --cc sha1-file.c
Simple merge