pgsql: pg_upgrade: fix initialization of thread argument

pg_upgrade: fix initialization of thread argument
Reorder initialization of thread argument marker to it happens before
reap_child() is called.
Backpatch to 9.3.

Branch
------
REL9_3_STABLE

Details
-------
http://git.postgresql.org/pg/commitdiff/b48f1dc2d35279b0814d60c24e488df2c295bb85

Modified Files
--------------
contrib/pg_upgrade/parallel.c | 72 ++++++++++++++++++++---------------------
1 file changed, 36 insertions(+), 36 deletions(-)

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