Fix parallel index builds for dynamic_shared_memory_type=none.

The previous code failed to realize that this setting effectively
disables parallelism, and would crash if it decided to attempt
parallelism anyway.  Instead, treat it as a disabling condition.

Kyotaro Horiguchi, who also reported the issue. Reviewed by Michael
Paquier and Peter Geoghegan.

Discussion: 
http://postgr.es/m/20180209.170635.256350357.horiguchi.kyot...@lab.ntt.co.jp

Branch
------
master

Details
-------
https://git.postgresql.org/pg/commitdiff/88ef48c1ccee6a2200e01318180cf521413b3012

Modified Files
--------------
src/backend/optimizer/plan/planner.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)

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