Optimise calls to tagToEnum#

Ever since we started using Int# to represent booleans unboxed (see PrimBool) we have had lots of code looking like

case tagToEnum# (a ># b) of
  False -> e1
  True  -> e2

It would be better (less code to optimise, more straightforward, more direct) to optimise this to

case a ># b of
  DEFAULT -> e1
  1#      -> e2

Happily, we already have a nice spot to do so: the caseRules function in SimplUtils.

Trac metadata

Trac field	Value
Version	8.0.1
Type	Bug
TypeOfFailure	OtherFailure
Priority	normal
Resolution	Unresolved
Component	Compiler
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