Fix bug: if one updated a secondary index column so that its alphabetical value did not change (e.g., abc -> aBc) and rolled back the update, InnoDB failed to return the value in the secondary index to its original value
row0upd.h:
  Correct typing error
sync0sync.ic:
  Remove inadvertently pushed sync debug code


innobase/include/sync0sync.ic:
  Remove inadvertently pushed sync debug code
innobase/include/row0upd.h:
  Correct typing error
innobase/row/row0umod.c:
  Fix bug: if one updated a secondary index column so that its alphabetical value did not change (e.g., abc -> aBc) and rolled back the update, InnoDB failed to return the value in the secondary index to its original value
innobase/btr/btr0cur.c:
  Fix bug: if one updated a secondary index column so that its alphabetical value did not change (e.g., abc -> aBc) and rolled back the update, InnoDB failed to return the value in the secondary index to its original value