This reverts commit a87a971b.

Reason for revert: required for revert of 
bbd740f0

Original change's description:
> [runtime] Inline SeqOneByteSubStringKey IsMatch and AsHandle
> 
> The performance actually matters to JSON parsing and this improves it by a % or
> 2.
> 
> In the longer run we should probably share the IsMatch implementation in
> StringTableKey directly and call a virtual GetBytes on the key implementation.
> 
> Change-Id: I838a106f9c8c52f0385057a52a8c0b9141ae025b
> Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1589977
> Commit-Queue: Toon Verwaest <verwaest@chromium.org>
> Auto-Submit: Toon Verwaest <verwaest@chromium.org>
> Reviewed-by: Igor Sheludko <ishell@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#61183}

TBR=ishell@chromium.org,verwaest@chromium.org

Change-Id: I8797310ef7834c04b44c735ce60813e3fb596013
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1594440Reviewed-by: Sigurd Schneider <sigurds@chromium.org>
Commit-Queue: Sigurd Schneider <sigurds@chromium.org>
Cr-Commit-Position: refs/heads/master@{#61193}