Revert of [string] Migrate String.prototype.{split,replace} to TF (patchset #12 id:220001 of https://codereview.chromium.org/2663803002/ )

Reason for revert:
Breaks win64 debug:
https://build.chromium.org/p/client.v8/builders/V8%20Win64%20-%20debug/builds/14967

Original issue's description:
> [string] Migrate String.prototype.{split,replace} to TF
>
> BUG=
>
> Review-Url: https://codereview.chromium.org/2663803002
> Cr-Commit-Position: refs/heads/master@{#42881}
> Committed: https://chromium.googlesource.com/v8/v8/+/65ad1e35d9a97c1126a55cc9d3014598fd224259

TBR=bmeurer@chromium.org,ishell@chromium.org,yangguo@chromium.org,jgruber@chromium.org
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=

Review-Url: https://codereview.chromium.org/2671673003
Cr-Commit-Position: refs/heads/master@{#42882}