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This is another step in fixing #13825 (based on D38 by Simon Marlow). This commit adds a few macros for accessing and modifying `Sp` (interpreter stack) and will be useful to allow sub-word indexing/pushing. (but that will be a separate change, this commit should introduce no changes in behavior) Signed-off-by: Michal Terepeta <michal.terepeta@gmail.com> Test Plan: ./validate Reviewers: bgamari, simonmar, austin, erikd Reviewed By: bgamari, erikd Subscribers: rwbarton, thomie GHC Trac Issues: #13825 Differential Revision: https://phabricator.haskell.org/D3744
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