When calling poll() on a fd associated with a filesystem, let POLLIN/POLLOUT behave identically to POLLRDNORM/POLLWRNORM.
When calling poll() on a fd associated with a filesystem, let POLLIN/POLLOUT
behave identically to POLLRDNORM/POLLWRNORM.

Submitted by: bde
PR: 27287
merge after: 1 week

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