Fix deserialization of pg_mcv_list values

Fix deserialization of pg_mcv_list values

There were multiple issues in deserialization of pg_mcv_list values.

Firstly, the data is loaded from syscache, but the deserialization was
performed after ReleaseSysCache(), at which point the data might have
already disappeared.  Fixed by moving the calls in statext_mcv_load,
and using the same NULL-handling code as existing stats.

Secondly, the deserialized representation used pointers into the
serialized representation.  But that is also unsafe, because the data
may disappear at any time.  Fixed by reworking and simplifying the
deserialization code to always copy all the data.

And thirdly, when deserializing values for types passed by value, the
code simply did memcpy(d,s,typlen) which however does not work on
bigendian machines.  Fixed by using fetch_att/store_att_byval.