swap_pager: Reduce code duplication for swp_page_meta_build callers
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Authored by jrtc27 on Oct 13 2022, 5:12 PM.

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Summary

All callers, when swp_pager_meta_build returns a swapblk other than
SWAPBLK_NONE, either fail a KASSERT or add it to their freerange. By
passing an optional freerange to swp_pager_meta_build we can instead
deduplicate this and have swp_pager_meta_build perform the assertion or
add it to the freerange as appropriate.