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Fix parallel index builds for dynamic_shared_memory_type=none.

The previous code failed to realize that this setting effectivelydisables parallelism, and would crash if it decided to attemptparallelism anyway. Instead, treat it as a disabling condition.Kyotaro Horiguchi, who also reported the issue. Reviewed by MichaelPaquier and Peter Geoghegan.Discussion:http://postgr.es/m/20180209.170635.256350357.horiguchi.kyotaro@lab.ntt.co.jp

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src/backend/optimizer/plan
- planner.c

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`‎src/backend/optimizer/plan/planner.c‎`

Lines changed: 2 additions & 1 deletion

Original file line number	Diff line number	Diff line change
`@@ -5825,7 +5825,8 @@ plan_create_index_workers(Oid tableOid, Oid indexOid)`
`5825`	`5825`	`doubleallvisfrac;`
`5826`	`5826`
`5827`	`5827`	`/* Return immediately when parallelism disabled */`
`5828`		`-if (max_parallel_maintenance_workers==0)`
	`5828`	`+if (dynamic_shared_memory_type==DSM_IMPL_NONE\|\|`
	`5829`	`+max_parallel_maintenance_workers==0)`
`5829`	`5830`	`return0;`
`5830`	`5831`
`5831`	`5832`	`/* Set up largely-dummy planner state */`

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Commit88ef48c

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`‎src/backend/optimizer/plan/planner.c‎`

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