remerge-diff: clean up temporary objdir at a central place

After running a diff between two things, or a series of diffs while
walking the history, the diff computation is concluded by a call to
diff_result_code() to extract the exit status of the diff machinery.

The function can work on "struct diffopt", but all the callers
historically and currently pass "struct diffopt" that is embedded in
the "struct rev_info" that is used to hold the remerge_diff bit and
the remerge_objdir variable that points at the temporary object
directory in use.

Redefine diff_result_code() to take the whole "struct rev_info" to
give it an access to these members related to remerge-diff, so that
it can get rid of the temporary object directory for any and all
callers that used the feature.  We can lose the equivalent code to
do so from the code paths for individual commands, diff-tree, diff,
and log.

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

diff.h

@@ -648,7 +648,7 @@ int do_diff_cache(const struct object_id *, struct diff_options *);
 int diff_flush_patch_id(struct diff_options *, struct object_id *, int);
 void flush_one_hunk(struct object_id *result, git_hash_ctx *ctx);
 
-int diff_result_code(struct diff_options *);
+int diff_result_code(struct rev_info *);
 
 int diff_no_index(struct rev_info *,
 		  int implicit_no_index, int, const char **);