pgsql: Use FLEXIBLE_ARRAY_MEMBER for HeapTupleHeaderData.t_bits[].

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

Branch
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master

Details
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http://git.postgresql.org/pg/commitdiff/e1a11d93111ff3fba7a91f3f2ac0b0aca16909a8

Modified Files
--------------
contrib/file_fdw/file_fdw.c | 2 +-
contrib/pageinspect/heapfuncs.c | 17 +++----
contrib/postgres_fdw/postgres_fdw.c | 2 +-
src/backend/access/common/heaptuple.c | 2 +-
src/backend/access/heap/heapam.c | 56 +++++++++++------------
src/backend/access/heap/tuptoaster.c | 10 ++--
src/backend/catalog/toasting.c | 2 +-
src/backend/executor/nodeHash.c | 2 +-
src/backend/optimizer/path/costsize.c | 6 +--
src/backend/optimizer/plan/planner.c | 4 +-
src/backend/optimizer/plan/subselect.c | 8 ++--
src/backend/optimizer/prep/prepunion.c | 2 +-
src/backend/optimizer/util/plancat.c | 2 +-
src/backend/replication/logical/decode.c | 30 ++++++------
src/backend/replication/logical/reorderbuffer.c | 26 +++++------
src/backend/utils/adt/trigfuncs.c | 6 +--
src/include/access/htup_details.h | 12 +++--
src/include/access/tuptoaster.h | 2 +-
src/include/replication/reorderbuffer.h | 10 ++--
19 files changed, 102 insertions(+), 99 deletions(-)