Remove table_scan_analyze_next_tuple unneeded parameter OldestXmin

heapam_scan_analyze_next_tuple() doesn't distinguish between dead and
recently dead tuples when counting them, so it doesn't need OldestXmin.
GetOldestNonRemovableTransactionId() isn't free, so removing it is a
win.

Looking at other table AMs implementing table_scan_analyze_next_tuple(),
we couldn't find one using OldestXmin either, so remove it from the
callback.

Author: Melanie Plageman <[email protected]>
Suggested-by: Kirill Reshke <[email protected]>
Reviewed-by: Kirill Reshke <[email protected]>
Reviewed-by: Andres Freund <[email protected]>
Reviewed-by: Chao Li <[email protected]>
Discussion: 
https://postgr.es/m/CALdSSPjvhGXihT_9f-GJabYU%3D_PjrFDUxYaURuTbfLyQM6TErg%40mail.gmail.com

Branch
------
master

Details
-------
https://git.postgresql.org/pg/commitdiff/284925508ae685a63ee056f89a336caecab64a63

Modified Files
--------------
src/backend/access/heap/heapam_handler.c | 8 +++++---
src/backend/commands/analyze.c           | 6 +-----
src/include/access/tableam.h             | 5 ++---
3 files changed, 8 insertions(+), 11 deletions(-)

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