Full GC doesn't need to run certain root constraints at all 
https://bugs.webkit.org/show_bug.cgi?id=166830
Summary Full GC doesn't need to run certain root constraints at all
Filip Pizlo
Reported 2017-01-08 14:07:45 PST
It's not clear if this would even be a valuable optimization. But if running certain constraints - like the weirdo CodeBlock re-visiting constraints - during a full GC turned out to be an issue then we have this as an option.
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