NEW 207712
[JSC] WeakGCMap should use WeakSet mechanism 
https://bugs.webkit.org/show_bug.cgi?id=207712
Summary [JSC] WeakGCMap should use WeakSet mechanism
Yusuke Suzuki
Reported 2020-02-13 11:55:36 PST
Almost always, key is included inside value. We were doing so just because our HashMap does not offer weak handling. But Ryosuke added it, so just use it to shrink table size.
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