Add CHECK_FOR_INTERRUPTS() to the repeat() function
The repeat() function loops for potentially a long time without
ever checking for interrupts. This prevents, for example, a query
cancel from interrupting until the work is all done. Fix by
inserting a CHECK_FOR_INTERRUPTS() into the loop.
Backpatch to all supported versions.
Discussion: https://www.postgresql.org/message-id/flat/
8692553c-7fe8-17d9-cbc1-
7cddb758f4c6%40joeconway.com