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This patch creates empty dump file when GHC was run with `-ddump-rule-firings` (or `-ddump-rule-rewrites`) and `-ddump-to-file` specified, and there were no rules applied. If dump already exists it will be overwritten by empty one. Test Plan: ./validate Reviewers: austin, thomie, bgamari Reviewed By: thomie, bgamari Subscribers: thomie Projects: #ghc Differential Revision: https://phabricator.haskell.org/D1514 GHC Trac Issues: #10320
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