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Inline mconcat (forward port from 8.10)

vdukhovni requested to merge trac-vdukhovni/ghc:inline-mconcat-9.0 into ghc-9.0

This has already been merged into 8.10, this MR forward-ports it to 9.0, though it is also in effect a partial backport of the pending !4890 (closed), where we're still waiting to resolve the performance impact of the other changes.

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