Provide a quick-check like package for use in the GHC testsuite.
## Summary
In various cases, like the `foundation` test to give one example it would be useful to have access to quickcheck or something similar.
I suggest we try adding either quickcheck itself, or a trimmed-down version of it (`ghc-quickcheck`?) to ghc for use in the testsuite.
The only potential downside I see is that this might lead to tests which are more expensive to run.
## Environment
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