runtime: remove periodic scavenging This change removes the periodic scavenger which goes over every span in the heap and scavenges it if it hasn't been used for 5 minutes. It should no longer be necessary if we have background scavenging (follow-up). For #30333. Change-Id: Ic3a1a4e85409dc25719ba4593a3b60273a4c71e0 Reviewed-on: https://go-review.googlesource.com/c/go/+/143157 Run-TryBot: Michael Knyszek <mknyszek@google.com> TryBot-Result: Gobot Gobot <gobot@golang.org> Reviewed-by: Austin Clements <austin@google.com>
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