Add file delete/create info when we overflow rename_limit

When we refuse to do rename detection due to having too many files
created or deleted, let the user know the numbers.  That way there is a
reasonable starting point for setting the diff.renamelimit option.

Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

diffcore-rename.c

@@ -493,7 +493,7 @@ void diffcore_rename(struct diff_options *options)
 	if ((num_create > rename_limit && num_src > rename_limit) ||
 	    (num_create * num_src > rename_limit * rename_limit)) {
 		if (options->warn_on_too_large_rename)
-			warning("too many files, skipping inexact rename detection");
+			warning("too many files (created: %d deleted: %d), skipping inexact rename detection", num_create, num_src);
 		goto cleanup;
 	}