Better conditionals

[Simon Peyton Jones]

Reid
As promised: could you look at Trac #13397, re tagToEnum#.
In particular, why is n-body running slower??
The change is basically a good one: removes a nasty special case in the code generator and de-clutters the code generally.  So I'm keen to keep it.
Not important for 8.2 though.
Thanks
Simon
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