Add CHECK_FOR_INTERRUPTS in pg_buffercache_pages while scanning the buffers

[SATYANARAYANA NARLAPURAM]

Please find attached patch that adds CHECK_FOR_INTERRUPTS while scanning
the buffers in pg_buffercache_pages. I checked other functions in the
module and this check already exists in pg_buffercache_numa_pages.

Thanks,
Satya

pg_buffercache_interrupt_check.patch
Description: Binary data