Revert "rm test-hackage from plugin branch"

This reverts commit 914c17db2614934cea4f691dd56c3a87e7e94fe4.
Revert "rm jsglr-orig from plugin branch"

This reverts commit 8fb75ee08628370dcbe22f96c162e8a30e526066.
Revert "rm haskell-parsetree-normalize from plugin branch"

This reverts commit 25552f8943cfbeedc11cf6299a909a6abc9745c9.