Fix part of bug #9670: if MySQL calls ::store_lock with TL_IGNORE, do not change prebuilt->select_lock_type; this fix may heal the assertion failures reported in UPDATE and multi-table UPDATE; it is not clear if this fixes the problems in OPTIMIZE TABLE


sql/ha_innodb.cc:
  Fix part of bug #9670: if MySQL calls ::store_lock with TL_IGNORE, do not change prebuilt->select_lock_type; this fix may heal the assertion failures reported in UPDATE and multi-table UPDATE; it is not clear if this fixes the problems in OPTIMIZE TABLE