Revert "Permit dump/reload of not-too-large >1GB tuples"

Alvaro Herrera <alvherre@alvh.no-ip.org>

Commit: e9e44a0953fa4ca54ace9500596c2ef930dbd1de
Author: Alvaro Herrera <alvherre@alvh.no-ip.org>
Date: 2016-12-06T15:46:03Z
Releases: 9.6.2
Revert "Permit dump/reload of not-too-large >1GB tuples"

This reverts commit 4e01ecae98275298c680c92fdba62daf603dc98e.
Per Tom Lane, changing the definition of StringInfoData amounts to an
ABI break, which is unacceptable in back branches.

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