Change pgstat_report_vacuum() to use Relation

This change makes pgstat_report_vacuum() more consistent with
pgstat_report_analyze(), that also uses a Relation.  This enforces a
policy that callers of this routine should open and lock the relation
whose statistics are updated before calling this routine.  We will
unlikely have a lot of callers of this routine in the tree, but it seems
like a good idea to imply this requirement in the long run.

Author: Bertrand Drouvot <[email protected]>
Suggested-by: Andres Freund <[email protected]>
Reviewed-by: Chao Li <[email protected]>
Discussion: 
https://postgr.es/m/[email protected]

Branch
------
master

Details
-------
https://git.postgresql.org/pg/commitdiff/f4e797171eac645eeae2a5e95bf3361bb7f7f0cc

Modified Files
--------------
src/backend/access/heap/vacuumlazy.c         |  3 +--
src/backend/utils/activity/pgstat_relation.c | 11 +++++------
src/include/pgstat.h                         |  4 ++--
3 files changed, 8 insertions(+), 10 deletions(-)

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