Adjustments to the btree fastpath optimization.

This optimization was introduced in commit 2b272734. The changes include
some additional comments and documentation, and also these more
substantive changes:
. ensure the optimization is only applied on the leaf node of a tree
whose root is on level 2 or more. It's of little value on small trees.
. Delay calling RelationSetTargetBlock() until after the critical
section of _bt_insertonpg
. ensure the optimization is also applied to unlogged tables.

Pavan Deolasee and Peter Geoghegan with some very light editing from me.




Modified Files
src/backend/access/nbtree/README      | 19 +++++++++++
src/backend/access/nbtree/nbtinsert.c | 63 +++++++++++++++++++++++++++++------
2 files changed, 71 insertions(+), 11 deletions(-)

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