More uses of HasDebugCallStack

For functions that can fail (with a panic) inside GHC, we use HasDebugCallStack => in the type to get more info about who called the function. Periodically we add more. They should have no effect in a non-DEBUG compiler.

This ticket is just a peg to hang MRs that add (or remove) HasDebugCallStack debug traces.

!3597 (closed) added a few HasDebugCallStack traces in substitution over Core

Edited Jul 13, 2020 by Simon Peyton Jones

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