Structure::isCheapDuringGC() could be even more accurate 
https://bugs.webkit.org/show_bug.cgi?id=157334
Summary Structure::isCheapDuringGC() could be even more accurate
Filip Pizlo
Reported 2016-05-03 19:19:38 PDT
It's meant to conservatively return false, but there are some uncommon cases where the current version may return true even though the structure is not cheap.
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