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[Ada] Fix possible overflow in table handling

From: Arnaud Charlet <charlet at adacore dot com>
To: gcc-patches at gcc dot gnu dot org
Cc: Robert Dewar <dewar at adacore dot com>
Date: Wed, 21 May 2014 06:53:02 -0400
Subject: [Ada] Fix possible overflow in table handling
Authentication-results: sourceware.org; auth=none

The Reallocate procedures in g-htable.adb and g-dyntab.adb
are subject to problems with possible intermediate overflow.
This has never been reported to cause problems, but in theory
it could cause performance degradation, so it is now fixed.
No test, because too much trouble to construct, and we have
never had an instance of this reported.

Tested on x86_64-pc-linux-gnu, committed on trunk

2014-05-21  Robert Dewar  <dewar@adacore.com>

	* g-table.adb, g-dyntab.adb (Reallocate): Fix possible overflow in
	computing new table size.

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