replace-object: move replace_map to object store

The relationship between an object X and another object Y that
replaces the object X is defined only within the scope of a
single repository.

The exception in reachability rule around these replacement objects
is also local to a repository (i.e. if traversal from refs reaches
X, then both X and Y are reachable and need to be kept from gc).

Signed-off-by: Stefan Beller <sbeller@google.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

1 files changed, 9 insertions, 0 deletions

diff --git a/replace-object.h b/replace-object.h
new file mode 100644
index 0000000000..f9a2b70eb8
--- /dev/null
+++ b/replace-object.h
@@ -0,0 +1,9 @@
+#ifndef REPLACE_OBJECT_H
+#define REPLACE_OBJECT_H
+
+struct replace_object {
+	struct oidmap_entry original;
+	struct object_id replacement;
+};
+
+#endif /* REPLACE_OBJECT_H */