Add regression tests exercising more code paths in nodeLimit.c.

Perusal of the code coverage report shows that the existing regression
test cases for LIMIT/OFFSET don't exercise the nodeLimit code paths
involving backwards scan, empty results, or null values of LIMIT/OFFSET.
Improve the coverage.



Modified Files
src/test/regress/expected/limit.out | 179 ++++++++++++++++++++++++++++++++++++
src/test/regress/sql/limit.sql      |  42 +++++++++
2 files changed, 221 insertions(+)

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