Improve performance on JetStream 2

[sur...@microsoft.com]

Hello everyone, 

I have been investigating v8's performance on JetStream 2 and found one interesting test(3d-cube SP) where we can achieve a significant performance gain.

Here's the link to the doc summarizing my findings.

Please take a look

Thanks!

[Leszek Swirski]

That's a great investigation, thanks! We can't really fix the benchmark, changing benchmarks invalidates historical data and confuses cross browser comparisons, so we've had to live with more than a few benchmark bugs.

However, the closed-over constructor observation is particularly interesting to me - it's hard to tell if this is a typical construct outside of benchmarks, but if it is then it suggests that we shouldn't be sharing feedback between closures of a constructor function. Call-site specific feedback would be another option that we've discussed in the past (for other reasons, e.g. calling dispatch functions). Good stuff.

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