[runtime] Immediately set the array-index hash in Uint32ToString and convert...
[runtime] Immediately set the array-index hash in Uint32ToString and convert to string in ForInPrepare This speeds up for/in over arrays. E.g.,: function f(a) { for (let i in a) { if (a[i] != a[i]) print(false); } } var a = new Array(10000000); a.fill(1); f(a); runs 3x faster after the change. BUG=chromium:703226 Change-Id: Iabc5e931d985a03f89440cd702b2feb3eb9f5c18 Reviewed-on: https://chromium-review.googlesource.com/459538Reviewed-by: Camillo Bruni <cbruni@chromium.org> Commit-Queue: Toon Verwaest <verwaest@chromium.org> Cr-Commit-Position: refs/heads/master@{#44108}
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