Make on-disk index representation separate from in-core one

This converts the index explicitly on read and write to its on-disk
format, allowing the in-core format to contain more flags, and be
simpler.

In particular, the in-core format is now host-endian (as opposed to the
on-disk one that is network endian in order to be able to be shared
across machines) and as a result we can dispense with all the
htonl/ntohl on accesses to the cache_entry fields.

This will make it easier to make use of various temporary flags that do
not exist in the on-disk format.

Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

builtin-blame.c

@@ -2092,7 +2092,7 @@ static struct commit *fake_working_tree_commit(const char *path, const char *con
 	if (!mode) {
 		int pos = cache_name_pos(path, len);
 		if (0 <= pos)
-			mode = ntohl(active_cache[pos]->ce_mode);
+			mode = active_cache[pos]->ce_mode;
 		else
 			/* Let's not bother reading from HEAD tree */
 			mode = S_IFREG | 0644;