Expose the GhcPrelude module.
Expose the GhcPrelude module.

This makes it simpler to load Modules importing it
when using ghc-the-package.

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Metric Decrease:
    haddock.compiler
-------------------------

sdiehl/ghc,sdiehl/ghc,sdiehl/ghc,sdiehl/ghc,sdiehl/ghc,sdiehl/ghc,sdiehl/ghc