Accept 20% dedgradation in Trac #5030 compile time
In commit 31621b12 * A collection of type-inference refactorings. I fixed a bug in the on-the-fly unifier. Usually the on-the-fly unifier (TcUnify) defers type function applications to the constraint solver. But in one situation it inconsistently did not defer, so a unification happened without reducing a type function. By a fluke this makes T5030 (specifcially the definition of cnst) much better. It turns out that consistently non-deferring type functions makes the test for #3064 go bad. So somehow the current, inconsistent situation was an accidental sweet spot. But it's a horrible sweet spot, relying on what was essentially a bug. So I've accepted the worsening (it's an exotic case), and opened #12724 to deal with the underlying cause.
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