rts: remove redundant stg_traceCcszh
This out-of-line primop has no Haskell wrapper and hasn't been used anywhere in the tree. Furthermore, the code gets in the way of !7632 (closed), so it should be garbage collected.
This out-of-line primop has no Haskell wrapper and hasn't been used anywhere in the tree. Furthermore, the code gets in the way of !7632 (closed), so it should be garbage collected.