mirrors/svelte

chore: robustify flatten (#17864)

Extracted from #17805. Currently we restore context inflatten unnecessarily in the case where we have async expressions but no blockers (the context is already correct), and we don’t unset context after blockers resolve in the case where we have them. The first bit is suboptimal, but the second bit feels bug-shaped, even though I’m not currently aware of any actual bugs that have resulted from this.

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