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This introduces a RTS option, -po, which allows the user to override the stem used to form the output file names of the heap profile and cost center summary. It's a bit unclear to me whether this is really the interface we want. Alternatively we could just allow the user to specify the `.hp` and `.prof` file names separately. This would arguably be a bit more straightforward and would allow the user to name JSON output with an appropriate `.json` suffix if they so desired. However, this would come at the cost of taking more of the option space, which is a somewhat precious commodity. Test Plan: Validate, try using `-po` RTS option Reviewers: simonmar, austin, erikd Reviewed By: simonmar Subscribers: thomie Differential Revision: https://phabricator.haskell.org/D3182
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