bufmgr: Make buffer hit helper

Already two places count buffer hits, requiring quite a few lines of
code since we do accounting in so many places. Future commits will add
more locations, so refactor into a helper.

Author: Melanie Plageman <[email protected]>
Reviewed-by: Nazir Bilal Yavuz <[email protected]>
Discussion: 
https://postgr.es/m/zljergweqti7x67lg5ije2rzjusie37nslsnkjkkby4laqqbfw@3p3zu522yykv

Branch
------
master

Details
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https://git.postgresql.org/pg/commitdiff/df09452c3209d542a19b9c4afa7a18c656cb4a80

Modified Files
--------------
src/backend/storage/buffer/bufmgr.c | 84 ++++++++++++++++++-------------------
1 file changed, 42 insertions(+), 42 deletions(-)

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