Add new flag -fwrite-interface for -fno-code.
Summary: Normally, -fno-code does not generate interface files. However, if you want to use it to type check over multiple runs of GHC, you will need the interface files to check source files further down the dependency chain; -fwrite-interface does this for you. Signed-off-by: Edward Z. Yang <firstname.lastname@example.org> Test Plan: clean validate, and a new test-case Reviewers: simonpj Subscribers: simonmar, relrod, carter Differential Revision: https://phabricator.haskell.org/D27
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