Purge DynFlags from GHC.Stg

Closed John Ericson requested to merge wip/no-dyn-flags-stg-lift into master

Also derive some more instances. GHC doesn't need them, but downstream consumers may need to e.g. put stuff in maps.

Progress towards #20964 (closed)

CC @doyougnu -- can you get more perms so I can mark you as a reviewer too?

Edited by John Ericson

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