3d2e59c22e
This seemed like a reasonable place to draw the line. Combined with the previous patch, code like this:
```
let arr = new Array(50000);
for (let i = arr.length - 1; i >= 0; i--) {
arr[i] = 0;
}
```
is 9-10x faster.
Differential Revision: https://phabricator.services.mozilla.com/D241533
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