One more idea... taken from reduce
Instead of doing the in check we [[Get]] the value and only if the value is
undefined do we need to do an [[HasProperty]] check.
ForEach: 184870
ForEach2: 367066
ForEach3: 452772
ForEachWithHoles: 123503
ForEach2WithHoles: 114547
ForEach3WithHoles: 110123
This is 3x faster!
The downside to both of these ideas is that with proxies it is detectable
that
the order no longer matches the spec.
Maybe these hacks are not worth it and we should just make [[HasProperty]]
fast... not that at will ever be as fast as ForEach3 since we always need
to do
the [[Get]] no matter what.
https://codereview.chromium.org/22545007/
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