The allowing resizing buffer pool might make some assertion code very
  expensive at Valgrind tests.

  This fix adds new debug variable to control allowing resizing buffer pool
  only for debug build.

  innodb_disable_resize_buffer_pool_debug : "Disable resizing buffer pool to
  make assertion code not expensive." (default on (disabled to resize
  buffer pool))

  The fix is only for debug build and some mtr tests.
  (need to set OFF explicitly, if tests resizing buffer pool with debug build)

  Reviewed by: Sunny Bains <sunny.bains@oracle.com>
  RB: 7835