Fix for BUG#36319 "Maria: table is not empty but DELETE and SELECT find no rows":

_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.

include/my_global.h

@@ -156,9 +156,14 @@
 #define __builtin_expect(x, expected_value) (x)
 #endif
 
-#define likely(x)	__builtin_expect((x),1)
-#define unlikely(x)	__builtin_expect((x),0)
-
+/**
+  The semantics of builtin_expect() are that
+  1) its two arguments are long
+  2) it's likely that they are ==
+  Those of our likely(x) are that x can be bool/int/longlong/pointer.
+*/
+#define likely(x)	__builtin_expect(((x) != 0),1)
+#define unlikely(x)	__builtin_expect(((x) != 0),0)
 
 /*
   The macros below are useful in optimising places where it has been

mysql-test/r/maria2.result

+CREATE TABLE t1 (
+line BLOB,
+kind ENUM('po', 'pp', 'rr', 'dr', 'rd', 'ts', 'cl') NOT NULL DEFAULT 'po',
+name VARCHAR(32)
+) transactional=0 row_format=page engine=maria;
+select count(*) from t1;
+count(*)
+810
+delete from t1 limit 1000;
+select count(*) from t1;
+count(*)
+0
+select name from t1;
+name
+check table t1 extended;
+Table	Op	Msg_type	Msg_text
+test.t1	check	status	OK
+drop table t1;

mysql-test/t/maria2.test

+--source include/have_maria.inc
+
+# Test for BUG#36319
+# "Maria: table is not empty but DELETE and SELECT find no rows"
+
+CREATE TABLE t1 (
+  line BLOB,
+  kind ENUM('po', 'pp', 'rr', 'dr', 'rd', 'ts', 'cl') NOT NULL DEFAULT 'po',
+  name VARCHAR(32)
+) transactional=0 row_format=page engine=maria;
+
+let $query=   INSERT INTO t1 (name, kind, line) VALUES 
+  ("Aadaouane", "pp", GeomFromText("POINT(32.816667 35.983333)")),
+  ("Aadassiye", "pp", GeomFromText("POINT(35.816667 36.216667)")),
+  ("Aadbel", "pp", GeomFromText("POINT(34.533333 36.100000)")),
+  ("Aadchit", "pp", GeomFromText("POINT(33.347222 35.423611)")),
+  ("Aadchite", "pp", GeomFromText("POINT(33.347222 35.423611)")),
+  ("Aadchit el Qoussair", "pp", GeomFromText("POINT(33.283333 35.483333)")),
+  ("Aaddaye", "pp", GeomFromText("POINT(36.716667 40.833333)")),
+  ("'Aadeissa", "pp", GeomFromText("POINT(32.823889 35.698889)")),
+  ("Aaderup", "pp", GeomFromText("POINT(55.216667 11.766667)")),
+  ("Qalaat Aades", "pp", GeomFromText("POINT(33.503333 35.377500)")),
+  ("A ad'ino", "pp", GeomFromText("POINT(54.812222 38.209167)")),
+  ("Aadi Noia", "pp", GeomFromText("POINT(13.800000 39.833333)")),
+  ("Aad La Macta", "pp", GeomFromText("POINT(35.779444 -0.129167)")),
+  ("Aadland", "pp", GeomFromText("POINT(60.366667 5.483333)")),
+  ("Aadliye", "pp", GeomFromText("POINT(33.366667 36.333333)")),
+  ("Aadloun", "pp", GeomFromText("POINT(33.403889 35.273889)")),
+  ("Aadma", "pp", GeomFromText("POINT(58.798333 22.663889)")),
+  ("Aadma Asundus", "pp", GeomFromText("POINT(58.798333 22.663889)")),
+  ("Aadmoun", "pp", GeomFromText("POINT(34.150000 35.650000)")),
+  ("Aadneram", "pp", GeomFromText("POINT(59.016667 6.933333)")),
+  ("Aadneskaar", "pp", GeomFromText("POINT(58.083333 6.983333)")),
+  ("Aadorf", "pp", GeomFromText("POINT(47.483333 8.900000)")),
+  ("Aadorp", "pp", GeomFromText("POINT(52.366667 6.633333)")),
+  ("Aadouane", "pp", GeomFromText("POINT(32.816667 35.983333)")),
+  ("Aadoui", "pp", GeomFromText("POINT(34.450000 35.983333)")),
+  ("Aadouiye", "pp", GeomFromText("POINT(34.583333 36.183333)")),
+  ("Aadouss", "pp", GeomFromText("POINT(33.512500 35.601389)")),
+  ("Aadra", "pp", GeomFromText("POINT(33.616667 36.500000)")),
+  ("Aadzi", "pp", GeomFromText("POINT(38.100000 64.850000)"));
+
+--disable_query_log
+let $1=90;
+while($1)
+{
+  eval $query;
+  dec $1;
+}
+let $1=90;
+while($1)
+{
+  delete from t1 limit 1;
+  delete from t1 limit 10;
+  delete from t1 limit 7;
+  delete from t1 limit 2;
+  dec $1;
+}
+--enable_query_log
+
+select count(*) from t1;
+delete from t1 limit 1000;
+select count(*) from t1;
+select name from t1;
+check table t1 extended;
+drop table t1;