This is a reland of a9f517e2
Original change's description:
> [builtins] Port Proxy set trap to CSA
> 
> Bug: v8:6560, v8:6557
> Change-Id: I329794607e8de324fc696652555aaaeafcf519ec
> Reviewed-on: https://chromium-review.googlesource.com/625940
> Reviewed-by: Igor Sheludko <ishell@chromium.org>
> Commit-Queue: Maya Lekova <mslekova@google.com>
> Cr-Commit-Position: refs/heads/master@{#47760}

Bug: v8:6560, v8:6557
Change-Id: I1b32992eac6cc5583a44703eed901e4ad15f1947
Reviewed-on: https://chromium-review.googlesource.com/647447
Commit-Queue: Maya Lekova <mslekova@google.com>
Reviewed-by: Igor Sheludko <ishell@chromium.org>
Cr-Commit-Position: refs/heads/master@{#47772}