std: initial sketch of workcache, barely does anything. #4024
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This actually breaks the build presently, due to something very strange associated with the Eq trait. Might need a snap? I don't get it, and will need help from @pcwalton diagnosing. Meanwhile comments / r+ appreciated. I just wanted to get a sketch landed so we could concentrate efforts. Note it has no caching logic yet, just moving-stuff-around and calling-thunks. Still takes some doing.
r? @brson, @erickt or @pcwalton