Import SQLite 3.10.2.

third_party/sqlite/src/test/tt3_vacuum.c

 /*
 ** 2014 December 9
 **
 ** The author disclaims copyright to this source code.  In place of
 ** a legal notice, here is a blessing:
 **
 **    May you do good and not evil.
 **    May you find forgiveness for yourself and forgive others.
 **    May you share freely, never taking more than you give.
 **
@@ skipping 70 matching lines @@
   sqlite3_enable_shared_cache(1);
   launch_thread(&err, &threads, vacuum1_thread_writer, 0);
   launch_thread(&err, &threads, vacuum1_thread_writer, 0);
   launch_thread(&err, &threads, vacuum1_thread_writer, 0);
   launch_thread(&err, &threads, vacuum1_thread_vacuumer, 0);
   join_all_threads(&err, &threads);
   sqlite3_enable_shared_cache(0);
 
   print_and_free_err(&err);
 }