optionally use arm intrinsics to debug functions#238
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…-reject Both bitmap scans now share a single per-qword body using popcount/ctz on USED_BIT_VECTOR (and its complement for canary-bearing slots). The USE_NEON path is reduced to a 2-qword load + zero/canary quick-reject that lets us skip 64 chunk slots at a time when the bitmap range is empty of relevant bits, matching the structure used in iso_scan_zone_free_slot_slow. Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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Use ARM intrinsics to improve performance of debug only sanity functions