sha1_file: convert sha1_object_info* to object_id

Convert sha1_object_info and sha1_object_info_extended to take pointers
to struct object_id and rename them to use "oid" instead of "sha1" in
their names.  Update the declaration and definition and apply the
following semantic patch, plus the standard object_id transforms:

@@
expression E1, E2;
@@
- sha1_object_info(E1.hash, E2)
+ oid_object_info(&E1, E2)

@@
expression E1, E2;
@@
- sha1_object_info(E1->hash, E2)
+ oid_object_info(E1, E2)

@@
expression E1, E2, E3;
@@
- sha1_object_info_extended(E1.hash, E2, E3)
+ oid_object_info_extended(&E1, E2, E3)

@@
expression E1, E2, E3;
@@
- sha1_object_info_extended(E1->hash, E2, E3)
+ oid_object_info_extended(E1, E2, E3)

Signed-off-by: Junio C Hamano <gitster@pobox.com>

reachable.c

@@ -77,7 +77,7 @@ static void add_recent_object(const struct object_id *oid,
 	 * later processing, and the revision machinery expects
 	 * commits and tags to have been parsed.
 	 */
-	type = sha1_object_info(oid->hash, NULL);
+	type = oid_object_info(oid, NULL);
 	if (type < 0)
 		die("unable to get object info for %s", oid_to_hex(oid));