Respect package visibility when deciding wired in packages.
Summary: Previously, we would consider ALL versions of a wired-in package, no matter if they were exposed or not, and pick the latest version. This patch is a minor refinement on the behavior: now we try to pick the wired in package from just the list of exposed packages, and if there are no candidates fall back on the full list. This means that if you do: -hide-all-packages -package wired-in-OLD-VERSION it will actually work by default (whereas previously you needed to *explicitly* -ignore-package the newer version). This is especially useful for the 'ghc' package. Fixes #9955. Signed-off-by: Edward Z. Yang <email@example.com> Test Plan: validate Reviewers: simonpj, austin Reviewed By: austin Subscribers: carter, thomie Differential Revision: https://phabricator.haskell.org/D603 GHC Trac Issues: #9955
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