Fix Trac #7453 on the 7.6 branch
This patch fixes a quite egregious bug. runTcS was intialising the 'untouchables' to NoUntouchables, which is quite wrong for the invocation in TcSimplify.simplifyInfer. Result: missed skolem-escape check and seg-fault city. All this is done differently, and better, in HEAD, so this patch is needed only on the branch.
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