Make rec_get_deleted_flag() return zero/nonzero instead of FALSE/TRUE.


innobase/btr/btr0btr.c:
  btr_page_get_sure_split_rec(): Fix bug caused by optimization
  (dereferencing null pointer in page_rec_is_supremum())
  btr_page_insert_fits(): Correct a debug assertion.
innobase/btr/btr0cur.c:
  Add debug assertions about page_rec_is_comp().
  Add UNIV_LIKELY and UNIV_UNLIKELY hints.
  Note that rec_get_deleted_flag() returns zero/nonzero ulint
  instead of FALSE/TRUE ibool.
innobase/include/page0page.ic:
  Move debug assertion to proper place.
innobase/include/rem0rec.h:
  rec_get_deleted_flag(), rec_set_deleted_flag(): Make the flag
  zero/nonzero in order to avoid FALSE/TRUE normalization in
  every rec_get_deleted_flag() call.
innobase/include/rem0rec.ic:
  rec_get_deleted_flag(), rec_set_deleted_flag(): Make the flag
  zero/nonzero in order to avoid FALSE/TRUE normalization in
  every rec_get_deleted_flag() call.
innobase/rem/rem0rec.c:
  rec_init_offsets(): Fix bugs introduced in optimization.
innobase/row/row0sel.c:
  Make debug assertion stricter.
innobase/row/row0vers.c:
  Note that rec_get_deleted_flag() returns zero/nonzero ulint
  instead of FALSE/TRUE ibool.