Function mozjs::jsapi::MemoryReportingSundriesThreshold

pub unsafe extern "C" fn MemoryReportingSundriesThreshold() -> usize

In memory reporting, we have concept of “sundries”, line items which are too small to be worth reporting individually. Under some circumstances, a memory reporter gets tossed into the sundries bucket if it’s smaller than MemoryReportingSundriesThreshold() bytes.

We need to define this value here, rather than in the code which actually generates the memory reports, because NotableStringInfo uses this value.