s/ulonglong/key_part_map/, comments


include/heap.h:
  wl#3700 - post-review fixes:
  s/ulonglong/key_part_map/
include/my_base.h:
  wl#3700 - post-review fixes:
  s/ulonglong/key_part_map/
include/myisam.h:
  wl#3700 - post-review fixes:
  s/ulonglong/key_part_map/
include/myisammrg.h:
  wl#3700 - post-review fixes:
  s/ulonglong/key_part_map/
sql/event_db_repository.cc:
  wl#3700 - post-review fixes:
  s/ulonglong/key_part_map/
sql/ha_partition.cc:
  wl#3700 - post-review fixes:
  s/ulonglong/key_part_map/
sql/ha_partition.h:
  wl#3700 - post-review fixes:
  s/ulonglong/key_part_map/
sql/sql_select.h:
  wl#3700 - post-review fixes:
  remove tab_to_keypart_map()