Put a CHECK_FOR_INTERRUPTS call into the loops that try to find a unique new
OID or new relfilenode. If the existing OIDs are sufficiently densely populated, this could take a long time (perhaps even be an infinite loop), so it seems wise to allow the system to respond to a cancel interrupt here. Per a gripe from Jacky Leng. Backpatch as far as 8.1. Older versions just fail on OID collision, instead of looping.
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