Avoid possibly-theoretical OOM crash hazard in hash_create().

Avoid possibly-theoretical OOM crash hazard in hash_create().

One place in hash_create() used DynaHashAlloc() as a convenient
shorthand for MemoryContextAlloc().  That was fine when it was
written, but it stopped being fine when 9c911ec06 changed
DynaHashAlloc() to use MCXT_ALLOC_NO_OOM (mea culpa).  Change
the code to call plain MemoryContextAlloc() as intended.

I think that this bug may be unreachable in practice, since we now
always create AllocSets with some space already allocated, so that
an OOM failure here for a non-shared hash table should be impossible
(with a hash table name of reasonable length anyway).  And there
aren't enough shared hash tables to make a crash for one of those
probable.  Nonetheless it's clearly not operating as designed, so
back-patch to v16 where 9c911ec06 came in.

Reported-by: Maksim Korotkov <[email protected]>
Author: Tom Lane <[email protected]>
Discussion: https://postgr.es/m/219bdccd460510efaccf90b57e5e5ef2@postgrespro.ru
Backpatch-through: 16