testsuite: Add (still broken) testcase for #12447
Test Plan: Validate Reviewers: austin Subscribers: thomie Differential Revision: https://phabricator.haskell.org/D2703 GHC Trac Issues: #12447
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Test Plan: Validate Reviewers: austin Subscribers: thomie Differential Revision: https://phabricator.haskell.org/D2703 GHC Trac Issues: #12447