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The LLVM code generator currently has a rather large amount of boilerplate devoted to piping around and building up various AST elements. This is rather unfortunate for a language which prides itself on ease of abstraction and detracts from readability. Here I continue a refactoring that I originally suggested in D991, using `WriterT` to factor out this pattern. `WriterT` is in general a bit problematic from an evaluation perspective, but the expressions here are small enough that it should be a problem in practice. Test Plan: Validate Reviewers: austin Reviewed By: austin Subscribers: thomie Differential Revision: https://phabricator.haskell.org/D1286
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