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Handle lack of DSM slots in parallel btree build.

If no DSM slots are available, a ParallelContext can still becreated, but its seg pointer is NULL. Teach parallel btree buildto cope with that by falling back to a regular non-parallel build,to avoid crashing with a segmentation fault.Back-patch to 11, where parallel CREATE INDEX landed.Reported-by: Nicola ContuReviewed-by: Peter GeogheganDiscussion:https://postgr.es/m/CA%2BhUKGJgJEBnkuODBVomyK3MWFvDBbMVj%3Dgdt6DnRPU-5sQ6UQ%40mail.gmail.com

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src/backend/access/nbtree
- nbtsort.c

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`‎src/backend/access/nbtree/nbtsort.c`

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Original file line number	Diff line number	Diff line change
`@@ -1331,6 +1331,15 @@ _bt_begin_parallel(BTBuildState *buildstate, bool isconcurrent, int request)`
`1331`	`1331`	`Assert(request>0);`
`1332`	`1332`	`pcxt=CreateParallelContext("postgres","_bt_parallel_build_main",`
`1333`	`1333`	`request);`
	`1334`	`+`
	`1335`	`+/* If no DSM segment was available, back out (do serial build) */`
	`1336`	`+if (pcxt->seg==NULL)`
	`1337`	`+{`
	`1338`	`+DestroyParallelContext(pcxt);`
	`1339`	`+ExitParallelMode();`
	`1340`	`+return;`
	`1341`	`+}`
	`1342`	`+`
`1334`	`1343`	`scantuplesortstates=leaderparticipates ?request+1 :request;`
`1335`	`1344`
`1336`	`1345`	`/*`

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Commit74618e7

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`‎src/backend/access/nbtree/nbtsort.c`

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