[pull] master from ruby:master#734
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pull[bot] merged 3 commits intoturkdevops:masterfrom Jan 31, 2026
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Previously we used two adjacent bits in the same word to store the object's age. This changes that to instead store the age in the same bit position across two adjacent words. This makes age use the exact same bit positions as the other bitmaps (just across two words).
This aims to speed up sweeping by clearing all age and wb_unprotected bits for unmarked objects. This should be faster because we can clear up to a whole plane of objects (64 slots) at once.
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