BTREE, HASH and RTREE are not reserved symbols anymore


mysql-test/t/loaddata.test:
  Removed empty lines
mysys/my_malloc.c:
  Fixed old style variable name
mysys/my_realloc.c:
  Fixed old style variable name
sql/sql_yacc.yy:
  BTREE, HASH and RTREE are not reserved symbols anymore
sql/table.cc:
  Simple optimization