Promote rep_hist bw functions to uint64_t.

The rest of rephist uses uint64_t internally. Let's make these take it too,
so we don't have to worry about overflowing size_t on 32 bit systems.

src/or/rephist.c

@@ -1363,7 +1363,7 @@ bw_arrays_init(void)
  * earlier than the latest <b>when</b> you've heard of.
  */
 void
-rep_hist_note_bytes_written(size_t num_bytes, time_t when)
+rep_hist_note_bytes_written(uint64_t num_bytes, time_t when)
 {
 /* Maybe a circular array for recent seconds, and step to a new point
  * every time a new second shows up. Or simpler is to just to have
@@ -1380,7 +1380,7 @@ rep_hist_note_bytes_written(size_t num_bytes, time_t when)
  * (like rep_hist_note_bytes_written() above)
  */
 void
-rep_hist_note_bytes_read(size_t num_bytes, time_t when)
+rep_hist_note_bytes_read(uint64_t num_bytes, time_t when)
 {
 /* if we're smart, we can make this func and the one above share code */
   add_obs(read_array, when, num_bytes);
@@ -1390,7 +1390,7 @@ rep_hist_note_bytes_read(size_t num_bytes, time_t when)
  * <b>when</b>. (like rep_hist_note_bytes_written() above)
  */
 void
-rep_hist_note_dir_bytes_written(size_t num_bytes, time_t when)
+rep_hist_note_dir_bytes_written(uint64_t num_bytes, time_t when)
 {
   add_obs(dir_write_array, when, num_bytes);
 }
@@ -1399,7 +1399,7 @@ rep_hist_note_dir_bytes_written(size_t num_bytes, time_t when)
  * <b>when</b>. (like rep_hist_note_bytes_written() above)
  */
 void
-rep_hist_note_dir_bytes_read(size_t num_bytes, time_t when)
+rep_hist_note_dir_bytes_read(uint64_t num_bytes, time_t when)
 {
   add_obs(dir_read_array, when, num_bytes);
 }

src/or/rephist.h

@@ -21,13 +21,13 @@ void rep_hist_note_extend_succeeded(const char *from_name,
                                     const char *to_name);
 void rep_hist_note_extend_failed(const char *from_name, const char *to_name);
 void rep_hist_dump_stats(time_t now, int severity);
-void rep_hist_note_bytes_read(size_t num_bytes, time_t when);
-void rep_hist_note_bytes_written(size_t num_bytes, time_t when);
+void rep_hist_note_bytes_read(uint64_t num_bytes, time_t when);
+void rep_hist_note_bytes_written(uint64_t num_bytes, time_t when);
 
 void rep_hist_make_router_pessimal(const char *id, time_t when);
 
-void rep_hist_note_dir_bytes_read(size_t num_bytes, time_t when);
-void rep_hist_note_dir_bytes_written(size_t num_bytes, time_t when);
+void rep_hist_note_dir_bytes_read(uint64_t num_bytes, time_t when);
+void rep_hist_note_dir_bytes_written(uint64_t num_bytes, time_t when);
 
 int rep_hist_bandwidth_assess(void);
 char *rep_hist_get_bandwidth_lines(void);