heapam: Pass number of required pages to RelationGetBufferForTuple()

A future commit will use this information to determine how aggressively to
extend the relation by. In heap_multi_insert() we know accurately how many
pages we need once we need to extend the relation, providing an accurate lower
bound for how much to extend.

Reviewed-by: Melanie Plageman <[email protected]>
Discussion: 
https://postgr.es/m/[email protected]

Branch
------
master

Details
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https://git.postgresql.org/pg/commitdiff/5279e9db8e8da3c310c0068da2de98df5a714b2e

Modified Files
--------------
src/backend/access/heap/heapam.c | 58 +++++++++++++++++++++++++++++++++++++---
src/backend/access/heap/hio.c    |  8 +++++-
src/include/access/hio.h         |  3 ++-
3 files changed, 63 insertions(+), 6 deletions(-)

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