[async] Compact AsyncState id for faster SFG rebuilding #2071
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Related issue = #742
Before:
synchronize
: 4.281rebuild_graph
inoptimize_listgen
: 0.799After:
synchronize
: 3.996 (1.07x faster)rebuild_graph
inoptimize_listgen
: 0.714 (1.12x faster)Sorry about the potential conflict with #2070. Let's merge #2070 first and I'll fix the conflicts here on my own.
The design is probably not elegant yet at this point, but let's first get the desired performance and then aim for elegance.
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