innobase/btr/btr0cur.c:
  Disable the mode PAGE_CUR_LE_OR_EXTENDS at compile-time
innobase/include/page0cur.h:
  Disable the mode PAGE_CUR_LE_OR_EXTENDS at compile-time
  Do not define PAGE_CUR_DBG unless #ifdef UNIV_SEARCH_DEBUG
innobase/page/page0cur.c:
  Disable the mode PAGE_CUR_LE_OR_EXTENDS at compile-time
  Disable PAGE_CUR_DBG unless #ifdef UNIV_SEARCH_DEBUG
  
  page_cur_try_search_shortcut(): Optimize the predicates
  (compare the result of page_cmp_dtuple_rec_with_match() against 0,
  use page_rec_is_supremum()).
  
  page_cur_search_with_match(): Compare the result of
  cmp_dtuple_rec_with_match() against zero, add UNIV_LIKELY hints,
  replace duplicated code with gotos.