Fix calculation of how much shared memory is required to store a TOC.

Commit ac883ac453 refactored shm_toc_estimate() but changed its calculation
of shared memory size for TOC incorrectly. Previously this could cause too
large memory to be allocated.

Back-patch to v11 where the bug was introduced.

Author: Takayuki Tsunakawa
Discussion: 
https://postgr.es/m/tyapr01mb2990bfb73170e2c4921e2c4dfe...@tyapr01mb2990.jpnprd01.prod.outlook.com

Branch
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master

Details
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https://git.postgresql.org/pg/commitdiff/2ad78a87f018260d4474eee63187e1cc73c9b976

Modified Files
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src/backend/storage/ipc/shm_toc.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)

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