Add SLRU tests for 64-bit page case
4ed8f0913b added 64-bit page numbering for SLRU. This commit adds tests for
page numbers higher than 2^32.
Author: Maxim Orlov
Reviewed-by: Aleksander Alekseev, Alexander Korotkov
Discussion: https://postgr.es/m/CACG%3DezZe1NQSCnfHOr78AtAZxJZeCvxrts0ygrxYwe%3DpyyjVWA%40mail.gmail.com
Discussion: https://postgr.es/m/CAJ7c6TPDOYBYrnCAeyndkBktO0WG2xSdYduTF0nxq%2BvfkmTF5Q%40mail.gmail.com