Improvements/bugfixes to signature reexport handling.
Summary: A number of changes: - Keep the TcGblEnv from typechecking the local signature around when we do merging. In particular, we setup tcg_imports and tcg_rdr_env according to the local signature. This improves our error output (for example, see bkpfail04) and also fixes a bug with reexporting modules in signatures (see bkpreex07) - Fix a bug in thinning, where if we had signature A(module A), this previously would have *thinned out* all of the inherited signatures. Now we treat every inherited signature as having come from an import like "import A", so a module A reexport will pick them up. - Recompilation checking now keeps track of dependent source files of the source signature; previously we forgot to retain this info. There's a manual update too. Signed-off-by: Edward Z. Yang <email@example.com> Test Plan: validate Reviewers: bgamari, austin Subscribers: thomie Differential Revision: https://phabricator.haskell.org/D3133
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