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(parent: 0600d27) | patch

Move MAX_BACKENDS to procnumber.h

Move MAX_BACKENDS to procnumber.h

MAX_BACKENDS influences many things besides postmaster. I e.g. noticed that we
don't have static assertions ensuring BUF_REFCOUNT_MASK is big enough for
MAX_BACKENDS, adding them would require including postmaster.h in
buf_internals.h which doesn't seem right.

While at that, add MAX_BACKENDS_BITS, as that's useful in various places for
static assertions (to be added in subsequent commits).

Reviewed-by: Thomas Munro <thomas.munro@gmail.com>
Discussion: https://postgr.es/m/wptizm4qt6yikgm2pt52xzyv6ycmqiutloyvypvmagn7xvqkce@d4xuv3mylpg4

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