NEW 172420
[JSC] Object.assign should have a fast path for usual final objects 
https://bugs.webkit.org/show_bug.cgi?id=172420
Summary [JSC] Object.assign should have a fast path for usual final objects
Yusuke Suzuki
Reported 2017-05-20 13:54:05 PDT
Object.assign performs [[Put]] in its loop. So it can invoke setters. That's why we need to check @propertyIsEnumerable for each key. But, if we know that object does not have such a thing, we can drop this @propertyIsEnumerable checks completely.
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