pgsql: Coercion sanity check in ri_HashCompareOp failed to allow for

Log Message:
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Coercion sanity check in ri_HashCompareOp failed to allow for enums, as per
example from Rod Taylor. On reflection the correct test here is for any
polymorphic type, not specifically ANYARRAY as in the original coding.

Tags:
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REL8_3_STABLE

Modified Files:
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pgsql/src/backend/commands:
tablecmds.c (r1.242.2.2 -> r1.242.2.3)
(http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/backend/commands/tablecmds.c?r1=1.242.2.2&r2=1.242.2.3)
pgsql/src/backend/utils/adt:
ri_triggers.c (r1.103.2.1 -> r1.103.2.2)
(http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/backend/utils/adt/ri_triggers.c?r1=1.103.2.1&r2=1.103.2.2)