This is a reland of 556f44c4

Original change's description:
> [strings] Fix hash for exactly 512MB long strings
> 
> Bug: chromium:1016237
> Change-Id: Idda1e44b5d578d1213aa54927ca68289bcdce8ac
> Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1878487
> Commit-Queue: Jakob Kummerow <jkummerow@chromium.org>
> Reviewed-by: Igor Sheludko <ishell@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#64552}

Bug: chromium:1016237
Change-Id: I92ff4da0b25877faddfd171105b77680f9e08037
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1918251Reviewed-by: Igor Sheludko <ishell@chromium.org>
Commit-Queue: Jakob Kummerow <jkummerow@chromium.org>
Cr-Commit-Position: refs/heads/master@{#65019}