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}