Revert of [Proxies] Support constructable proxy as new.target (patchset #3 id:40001 of https://codereview.chromium.org/1481613003/ )

Reason for revert:
[Sheriff] Breaks:
https://build.chromium.org/p/client.v8/builders/V8%20Linux%20-%20nosnap%20-%20debug/builds/3977

Original issue's description:
> [Proxies] Support constructable proxy as new.target
>
> BUG=v8:1543, v8:3330, v8:3931
> LOG=n
>
> Committed: https://crrev.com/88ac8aa5236195137d4a7aa18bcc5650a3bdca5a
> Cr-Commit-Position: refs/heads/master@{#32346}

TBR=ishell@chromium.org,verwaest@chromium.org
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=v8:1543, v8:3330, v8:3931

Review URL: https://codereview.chromium.org/1480673004

Cr-Commit-Position: refs/heads/master@{#32350}