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Ben Gamari authored
We will need to use these to setup proper unwinding information for the stg_stop_thread closure. This pokes a hole in the STG abstraction, exposing the machine's stack pointer register so that we can accomplish this. We also expose a dummy return address register, which corresponds to the register used to hold the DWARF return address. Differential Revision: https://phabricator.haskell.org/D1225
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