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Andreas Klebinger's avatar
Andreas Klebinger authored
This prevents the register being picked up as a scratch register.
Otherwise the allocator would be free to use it before a call. This
fixes #14619.

Test Plan: ci, repro case on #14619

Reviewers: bgamari, Phyx, erikd, simonmar, RyanGlScott, simonpj

Reviewed By: Phyx, RyanGlScott, simonpj

Subscribers: simonpj, RyanGlScott, Phyx, rwbarton, thomie, carter

GHC Trac Issues: #14619

Differential Revision: https://phabricator.haskell.org/D4348

(cherry picked from commit add4e1f1)
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