Fixes to not trigger end-consistency testing of pagecache.

- Moved end_pagecache() to after maria_close()
- Flush page cache before closing files (in maria_pack)
Fixed test suite failure for PBXT

mysql-test/suite/pbxt/r/select.result:
  We mask out the 'rows' column because it may differ from run to run
mysql-test/suite/pbxt/t/select.test:
  We mask out the 'rows' column because it may differ from run to run
storage/maria/maria_chk.c:
  Moved end_pagecache() to after maria_close() to not trigger end-consistency testing of pagecache.
storage/maria/maria_pack.c:
  Moved end_pagecache() to after maria_close() to not trigger end-consistency testing of pagecache.
  flush page cache before closing files.

mysql-test/suite/pbxt/r/select.result

@@ -3447,14 +3447,12 @@ insert into t2 select A.a, B.a, C.a, C.a from t1 A, t1 B, t1 C;
 analyze table t2;
 Table	Op	Msg_type	Msg_text
 test.t2	analyze	status	OK
-select 'In next EXPLAIN, B.rows must be exactly 10:' Z;
-Z
-In next EXPLAIN, B.rows must be exactly 10:
+In next EXPLAIN, B.rows must be exactly 10 (when using MyISAM):
 explain select * from t2 A, t2 B where A.a=5 and A.b=5 and A.C<5
 and B.a=5 and B.b=A.e and (B.b =1 or B.b = 3 or B.b=5);
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	A	range	PRIMARY	PRIMARY	12	NULL	1	Using where
-1	SIMPLE	B	ref	PRIMARY	PRIMARY	8	const,test.A.e	1	
+1	SIMPLE	A	range	PRIMARY	PRIMARY	12	NULL	#	Using where
+1	SIMPLE	B	ref	PRIMARY	PRIMARY	8	const,test.A.e	#	
 drop table t1, t2;
 CREATE TABLE t1 (a int PRIMARY KEY, b int, INDEX(b));
 INSERT INTO t1 VALUES (1, 3), (9,4), (7,5), (4,5), (6,2),

mysql-test/suite/pbxt/t/select.test

@@ -2910,8 +2910,10 @@ insert into t1 values (0),(1),(2),(3),(4),(5),(6),(7),(8),(9);
 create table t2 (a int, b int, c int, e int, primary key(a,b,c));
 insert into t2 select A.a, B.a, C.a, C.a from t1 A, t1 B, t1 C;
 analyze table t2;
-select 'In next EXPLAIN, B.rows must be exactly 10:' Z;
+-- echo In next EXPLAIN, B.rows must be exactly 10 (when using MyISAM):
 
+# We mask out the 'rows' column because it may differ from run to run
+--replace_column 9 #
 explain select * from t2 A, t2 B where A.a=5 and A.b=5 and A.C<5
           and B.a=5 and B.b=A.e and (B.b =1 or B.b = 3 or B.b=5);
 drop table t1, t2;

storage/maria/maria_chk.c

@@ -1339,12 +1339,12 @@ static int maria_chk(HA_CHECK *param, char *filename)
   maria_lock_database(info, F_UNLCK);
 
 end2:
-  end_pagecache(maria_pagecache, 1);
   if (maria_close(info))
   {
     _ma_check_print_error(param, default_close_errmsg, my_errno, filename);
     DBUG_RETURN(1);
   }
+  end_pagecache(maria_pagecache, 1);
   if (error == 0)
   {
     if (param->out_flag & O_NEW_DATA)

storage/maria/maria_pack.c

@@ -690,6 +690,8 @@ static int compress(PACK_MRG_INFO *mrg,char *result_table)
     error|=my_close(new_file,MYF(MY_WME));
     if (!result_table)
     {
+      (void) flush_pagecache_blocks(isam_file->s->pagecache, &isam_file->dfile,
+                                    FLUSH_RELEASE);
       error|=my_close(isam_file->dfile.file, MYF(MY_WME));
       isam_file->dfile.file= -1;	/* Tell maria_close file is closed */
       isam_file->s->bitmap.file.file= -1;
@@ -763,13 +765,13 @@ static int compress(PACK_MRG_INFO *mrg,char *result_table)
   DBUG_RETURN(0);
 
  err:
-  end_pagecache(maria_pagecache, 1);
   free_counts_and_tree_and_queue(huff_trees,trees,huff_counts,fields);
   if (new_file >= 0)
     VOID(my_close(new_file,MYF(0)));
   if (join_maria_file >= 0)
     VOID(my_close(join_maria_file,MYF(0)));
   mrg_close(mrg);
+  end_pagecache(maria_pagecache, 1);
   VOID(fprintf(stderr, "Aborted: %s is not compressed\n", org_name));
   DBUG_RETURN(-1);
 }