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runtime: record in-use spans in a page-indexed bitmap
This adds a bitmap indexed by page number that marks the starts of in-use spans. This will be used to quickly find in-use spans with no marked objects for sweeping. For #18155. Change-Id: Icee56f029cde502447193e136fa54a74c74326dd Reviewed-on: https://go-review.googlesource.com/c/138957 Run-TryBot: Austin Clements <austin@google.com> TryBot-Result: Gobot Gobot <gobot@golang.org> Reviewed-by: Rick Hudson <rlh@golang.org> Reviewed-by: Michael Knyszek <mknyszek@google.com>
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