repository: create disable_replace_refs()

Several builtins depend on being able to disable the replace references
so we actually operate on each object individually. These currently do
so by directly mutating the 'read_replace_refs' global.

A future change will move this global into a different place, so it will
be necessary to change all of these lines. However, we can simplify that
transition by abstracting the purpose of these global assignments with a
method call.

We will need to keep this read_replace_refs global forever, as we want
to make sure that we never use replace refs throughout the life of the
process if this method is called. Future changes may present a
repository-scoped version of the variable to represent that repository's
core.useReplaceRefs config value, but a zero-valued read_replace_refs
will always override such a setting.

Signed-off-by: Derrick Stolee <derrickstolee@github.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

builtin/cat-file.c

@@ -805,7 +805,7 @@ static int batch_objects(struct batch_options *opt)
 		if (repo_has_promisor_remote(the_repository))
 			warning("This repository uses promisor remotes. Some objects may not be loaded.");
 
-		read_replace_refs = 0;
+		disable_replace_refs();
 
 		cb.opt = opt;
 		cb.expand = &data;