_ma_scan_block_record() has "while (likely(bits))" where bits is ulonglong, so was cast to long
which lost most significant bits (32-bit linux), and test yielded false.

include/my_global.h:
  It's too easy to think that because "if (some_longlong)" works as intended, "if (likely(longlong))" will work too,
  though it does not. Making likely() cast to bool.
mysql-test/r/maria2.result:
  Result. Before fixing the bug, 810 was 812 and 0 was 812 (DELETE and SELECT found no rows
  though they were there).
mysql-test/t/maria2.test:
  Testcase for the bug. maria.test is huge now, so starting a second test file instead.