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TTG: replace Void/NoExtCon with DataConCantHappen

Krzysztof Gogolewski requested to merge wip/ttg-void into master

There were two ways to indicate that a TTG constructor is unused in a phase: NoExtCon and Void. I think this was just an oversight.

This unifies the code to always use NoExtCon, following earlier naming discussion: !1271 (comment 210339)

Edited by Krzysztof Gogolewski

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