This is a reland of b2bf43d5
Original change's description:
> [runtime] Load only 10 bits as PropertyArray length
> 
> Bug: v8:6404
> Change-Id: I187f20006c14aab4a36e2bfef31ca68ebb249e43
> Reviewed-on: https://chromium-review.googlesource.com/576516
> Commit-Queue: Sathya Gunasekaran <gsathya@chromium.org>
> Reviewed-by: Jakob Kummerow <jkummerow@chromium.org>
> Reviewed-by: Ulan Degenbaev <ulan@chromium.org>
> Reviewed-by: Michael Starzinger <mstarzinger@chromium.org>
> Reviewed-by: Camillo Bruni <cbruni@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#46822}

TBR=ulan@chromium.org,mstarzinger@chromium.org,cbruni@chromium.org

Bug: v8:6404
Change-Id: Ia0d8bf276fcfc7bfce704d68ba3427d7ba941ba9
Reviewed-on: https://chromium-review.googlesource.com/583708
Commit-Queue: Sathya Gunasekaran <gsathya@chromium.org>
Reviewed-by: Jakob Kummerow <jkummerow@chromium.org>
Cr-Commit-Position: refs/heads/master@{#46850}