Prevent integer overflows during units conversion when displaying a GUC
variable that has units. Per report from Stefan Kaltenbrunner. Backport to 8.2. I also backported my patch of 2007-06-21 that prevented comparable overflows on the input side, since that now seems to have enough field track record to be back-patched safely. That patch included addition of hints listing the available unit names, which I did not bother to strip out of it --- this will make a little more work for the translators, but they can copy the translation from 8.3, and anyway an untranslated hint is better than no hint.
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