Using a OneByte table allows branches to be removed if the function is inlined
in a place where we statically know the character is onebyte.

This adds support for line terminators. To support 2byte line terminators as
well this adds a entries for the lower byte into the table so we can often take
a faster path in that case as well.

Change-Id: Ibd08d540e0e13047d6c1f675c187f14fda4336c5
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2445471Reviewed-by: Leszek Swirski <leszeks@chromium.org>
Reviewed-by: Toon Verwaest <verwaest@chromium.org>
Commit-Queue: Toon Verwaest <verwaest@chromium.org>
Cr-Commit-Position: refs/heads/master@{#70286}