Implement the state hack without modifiyng OneShotInfo
Previously, the state hack would be implemented in mkLocalId, by looking at the type, and setting the OneShot flag accordingly. This patch changes this so that the OneShot flag faithfully represents what our various analyses found out, and the State Hack is implemented by adjusting the accessors, in particular isOneShotBndr and idStateHackOneShotInfo. This makes it easier to understand what's going on in the analyses, and de-clutters core dumps and interface files. I don’t expect any change in behaviour, at least not in non-fringe cases.
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