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* Add a new flag, `-fignore-optim-changes`, allowing them to avoid
recompilation if the only changes are to the `-O` level or to
flags controlling optimizations.
* When `-fignore-optim-changes` is *off*, recompile when optimization
flags (e.g., `-fno-full-laziness`) change. Previously, we ignored
these unconditionally when deciding whether to recompile a module.
Reviewers: austin, bgamari, simonmar
Reviewed By: simonmar
Subscribers: duog, carter, simonmar, rwbarton, thomie
GHC Trac Issues: #13604
Differential Revision: https://phabricator.haskell.org/D4123
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