Insert CHECK_FOR_INTERRUPTS calls into loops in dbsize.c, to ensure that the various disk-size-reporting functions will respond to query cancel reasonably promptly even in very large databases.  Per report from Kevin Grittner.
Insert CHECK_FOR_INTERRUPTS calls into loops in dbsize.c, to ensure that
the various disk-size-reporting functions will respond to query cancel
reasonably promptly even in very large databases.  Per report from
Kevin Grittner.

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