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The unariser ensures that we never use case binders that are void, unboxed sums, or unboxed tuples. However, previously StgLint was enforcing this invariant even before the unariser was running, giving rise to spurious lint failures. Fix this. Following CoreLint, we introduce a LintFlags environment to the linter monad, allowing for additional flags to be easily accomodated in the future. See #14118. Test Plan: Build GHC with -dstg-lint Reviewers: simonpj, austin Subscribers: rwbarton, thomie GHC Trac Issues: #14118 Differential Revision: https://phabricator.haskell.org/D3889
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