Make smgr access for a BufferManagerRelation safer in relcache inval

Currently there's no bug, because we have no code path where we
invalidate relcache entries where it'd cause a problem.  But it's more
robust to do it this way in case we introduce such a path later, as some
Postgres forks reportedly already have.

Author: Daniil Davydov <[email protected]>
Reviewed-by: Stepan Neretin <[email protected]>
Discussion: 
https://postgr.es/m/CAJDiXgj3FNzAhV+jjPqxMs3jz=ogpohsoxfj_fh-l+ns+13...@mail.gmail.com

Branch
------
master

Details
-------
https://git.postgresql.org/pg/commitdiff/b7cc6474e930d4429b15657d6910e1e32066de5e

Modified Files
--------------
src/backend/storage/buffer/bufmgr.c   | 59 ++++++++++++++++-------------------
src/backend/storage/buffer/localbuf.c | 10 +++---
src/include/storage/bufmgr.h          | 15 ++++++---
3 files changed, 44 insertions(+), 40 deletions(-)

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