Use FLEXIBLE_ARRAY_MEMBER for HeapTupleHeaderData.t_bits[].

Tom Lane <tgl@sss.pgh.pa.us>

Commit: e1a11d93111ff3fba7a91f3f2ac0b0aca16909a8
Author: Tom Lane <tgl@sss.pgh.pa.us>
Date: 2015-02-21T20:13:06Z
Releases: 9.5.0
Use FLEXIBLE_ARRAY_MEMBER for HeapTupleHeaderData.t_bits[].

This requires changing quite a few places that were depending on
sizeof(HeapTupleHeaderData), but it seems for the best.

Michael Paquier, some adjustments by me

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