pgsql: Turn special page pointer validation to static inline function

Turn special page pointer validation to static inline function

Inclusion of multiple macros inside another macro was pushing MSVC
past its size liimit. Reported by buildfarm.

Branch
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master

Details
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http://git.postgresql.org/pg/commitdiff/56dffb5a73ab157fc8d35a76c1170d656a051f14

Modified Files
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src/include/storage/bufpage.h | 23 ++++++++++++++++++++---
1 file changed, 20 insertions(+), 3 deletions(-)

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