Support HasCallStack for calls to panic

As far as I can tell panic only reports cost center callstacks currently.

It would be useful to include information provided by HasCallStack if available as well.

When using the GHC API (or hacking on GHC itself) this would be a convenient way to get more information about what lead to an error that triggers panic in a different part of the compiler.

Trac metadata

Trac field	Value
Version	8.2.1
Type	FeatureRequest
TypeOfFailure	OtherFailure
Priority	low
Resolution	Unresolved
Component	GHC API
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