This patch changes it so that we do not free old BP `page_hash`, but rather modify it's parameters, during resize.

RB: 26084
Reviewed-by: Marcin Babij <marcin.babij@oracle.com>
Reviewed-by: Yasufumi Kinoshita <yasufumi.kinoshita@oracle.com>

mysql/mysql-server@ea3adc6a1192e1bca4b4894fd7037e29fbcf0bd0