innobase/btr/btr0btr.c:
  Remove parameter n_fields from cmp_rec_rec()
innobase/btr/btr0cur.c:
  Remove parameter n_fields from cmp_rec_rec_with_match()
innobase/btr/btr0pcur.c:
  Remove parameter n_fields from cmp_rec_rec()
innobase/include/rem0cmp.h:
  Remove parameter n from cmp_rec_rec_with_match() and cmp_rec_rec()
innobase/include/rem0cmp.ic:
  Remove parameter n from cmp_rec_rec()
innobase/include/rem0rec.ic:
  Correct the implementation of rec_offs_nth_size() (Bug #7493)
innobase/page/page0page.c:
  Remove parameter n_fields from cmp_rec_rec()
innobase/rem/rem0cmp.c:
  Remove parameter n from cmp_rec_rec_with_match()
innobase/rem/rem0rec.c:
  rec_get_offsets(): Pass the number of allocated elements to
  rec_offs_set_n_alloc() instead of the number of allocated bytes,
  so that debugging assertions are more likely to detect
  out-of-bounds errors.