Revert of Restore per-TypedArray-class length accessors as a perf workaround (patchset #2 id:20001 of https://codereview.chromium.org/1624383003/ )

Reason for revert:
This patch actually seemed to cause a further GameBoy regression! Reverting it seems to address the regression.

Original issue's description:
> Restore per-TypedArray-class length accessors as a perf workaround
>
> This patch is a workaround to the performance regression caused by
> implementing the ES2015 TypedArray prototype chain: Include a
> per-TypedArray-subclass length getter so that the superclass getter does
> not become polymorphic. The patch appears to fix a regression in the
> Gameboy Octane benchmark.
>
> BUG=chromium:579905
> R=adamk
> LOG=Y
>
> Committed: https://crrev.com/03ce7711e474a0ef74f723b30ae1527c89dec010
> Cr-Commit-Position: refs/heads/master@{#33501}

R=adamk@chromium.org
BUG=chromium:579905,chromium:593634
LOG=Y

Review URL: https://codereview.chromium.org/1812143004

Cr-Commit-Position: refs/heads/master@{#34906}