[sqlsmith] Failed assertion in TS_phrase_execute

Hi,

the query below triggers an assertion in TS_phrase_execute. Testing was
done on master at dbdfd11.

regards,
Andreas

-- TRAP: FailedAssertion("!(curitem->qoperator.oper == 4)", File: "tsvector_op.c", Line: 1432)

select 'moscow' @@
ts_rewrite('moscow', 'moscow',
ts_rewrite(
tsquery_phrase('moscow','moscow'),
'moscow',
$$ 'sanct' & 'peter'$$));