pgsql: Avoid inserting no-op Limit plan nodes.

Avoid inserting no-op Limit plan nodes.

This was discussed in connection with the patch to avoid inserting no-op
Result nodes, but not actually implemented therein.

Branch
------
master

Details
-------
http://git.postgresql.org/pg/commitdiff/1a1832eb085e5bca198735e5d0e766a3cb61b8fc

Modified Files
--------------
src/backend/optimizer/plan/planner.c | 57 +++++++++++++++++++++++-
src/test/regress/expected/updatable_views.out | 60 +++++++++++-------------
2 files changed, 84 insertions(+), 33 deletions(-)

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