This is a reland of f4c14fd9

TBR=jgruber@chromium.org

Original change's description:
> [regexp] implement regexp property sequence proposal
>
> Also-By: mathias@chromium.org
> Bug: v8:7467
> Change-Id: I9fd6e61f4da1097c2375f671b4801e9730f792c4
> Reviewed-on: https://chromium-review.googlesource.com/1227974
> Commit-Queue: Yang Guo <yangguo@chromium.org>
> Reviewed-by: Jakob Gruber <jgruber@chromium.org>
> Reviewed-by: Mathias Bynens <mathias@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#55991}

Bug: v8:7467
Change-Id: If07137dea5a8ea42dbff1d749d997eb4ae055d80
Reviewed-on: https://chromium-review.googlesource.com/1232634Reviewed-by: Yang Guo <yangguo@chromium.org>
Reviewed-by: Jakob Gruber <jgruber@chromium.org>
Commit-Queue: Yang Guo <yangguo@chromium.org>
Cr-Commit-Position: refs/heads/master@{#56017}