Add basic API for a global system table #1156
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This is a much simpler version than #905. Just the bare minimum: add functions to set and get the global system table, set the global system table in the
entry
macro, and also makeexit_boot_services
unsafe.(I would still like to go in the direction of #905, but I think we should move a little incrementally so that we have a better chance of catching mistakes along the way.)
#893
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