pgsql: Set correct cost data in Gather node added by force_parallel_mod

Set correct cost data in Gather node added by force_parallel_mode.

We were just leaving the cost fields zeroes, which produces obviously bogus
output with force_parallel_mode = on. With force_parallel_mode = regress,
the zeroes are hidden, but I wonder if they wouldn't still confuse add-on
code such as auto_explain.

Branch
------
master

Details
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http://git.postgresql.org/pg/commitdiff/0e495c5e2f97aa7e2323705a6daed73cdd6c168c

Modified Files
--------------
src/backend/optimizer/plan/planner.c | 15 +++++++++++++++
1 file changed, 15 insertions(+)

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