[Webkit-unassigned] [Bug 258660] private class members are much, much slower than public members

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=258660

--- Comment #4 from Jarred Sumner <jarred at jarredsumner.com> ---
I've attached a microbenchmark that can be run from the jsc shell directly.

```
❯ jsc -m out.js
cpu: unknown
runtime: unknown (unknown)

benchmark                 time (avg)             (min … max)       p75       p99      p995
------------------------------------------------------------ -----------------------------
Polyfillprivate        81.76 ms/iter   (79.48 ms … 84.84 ms)  82.04 ms  84.84 ms  84.84 ms
NativePrivates         41.32 ms/iter   (40.31 ms … 43.61 ms)  41.76 ms  43.61 ms  43.61 ms
ConventionalPrivates  919.52 µs/iter   (619.67 µs … 2.65 ms) 780.25 µs   1.95 ms   1.96 ms
```

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