Add conditional CallStack constraints to common partial utility functions

There are a variety of common utility functions used throughout GHC which are partial (e.g. many of the helpers in Type, for instance, kindPrimRep). It would be great if [ImplicitCallStacks] would identify their callers. However, we likely don't want to pay the cost of passing around CallStacks during normal compilation so I propose we make them conditional on DEBUG. That is, define

#if DEBUG
type DebugCallStack = CallStack
#else
type DebugCallStack = (() :: Constraint)
#endif

Now we can sprinkle DebugCallStack constraints about GHC and get the best of both worlds!

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