c545e9524d
Since a4d75c86b, some buildfarm members have been warning that Assert(attnum <= MaxAttrNumber); is useless if attnum is an AttrNumber. I'm not certain how plausible it is that the value coming out of the bitmap could actually exceed MaxAttrNumber, but we seem to have thought that that was possible back in 7300a6995. Revert the intermediate variable to int so that we have the same overflow protection as before.
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