Modify tuptoaster's API so that it does not try to modify the passed

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

Commit: c8de36352fe72ae2265eb53a6e1bf334e4f24888
Author: Tom Lane <tgl@sss.pgh.pa.us>
Date: 2005-11-20T18:38:42Z
Releases: 8.1.1
Modify tuptoaster's API so that it does not try to modify the passed
tuple in-place, but instead passes back an all-new tuple structure if
any changes are needed.  This is a much cleaner and more robust solution
for the bug discovered by Alexey Beschiokov; accordingly, revert the
quick hack I installed yesterday.
With this change, HeapTupleData.t_datamcxt is no longer needed; will
remove it in a separate commit in HEAD only.

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