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runtime: sysUsed often called on non-scavenged memory #36603
In working on #36507, I noticed that one source of regression on Darwin was that
On systems where
This contributed very slightly to the performance regression in #36218, but not enough to cause it to block the 1.14 release.
The fix here is straight-forward: we just need to lower the call of
This isn't essential. Let's move it to 1.16. No need to backport, either, the performance regression here is very slight in practice (even in microbenchmarks that specifically seem to trigger bad behavior here), and other improvements probably totally overcame it in practice. Worth fixing, but not with any urgency.