This reverts commit 9c4200b2.

Reason for revert: breaks arm64 msan: https://ci.chromium.org/p/v8/builders/luci.v8.ci/V8%20Linux%20-%20arm64%20-%20sim%20-%20MSAN/22108

Original change's description:
> [scanner] Faster SkipMultiLineComment by avoiding a copy.
> 
> Avoid coping the last character to a local variable, by checking the parsing
> state in a different order.
> 
> BUG=v8:7926
> 
> Change-Id: I0b62f711674beac8c81a25dd566a5ed0d681948b
> Reviewed-on: https://chromium-review.googlesource.com/1148456
> Commit-Queue: Florian Sattler <sattlerf@google.com>
> Reviewed-by: Marja Hölttä <marja@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#54657}

TBR=marja@chromium.org,sattlerf@google.com

Change-Id: I665bce8214e6d0b8f8a619820ff13f37bc722332
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: v8:7926
Reviewed-on: https://chromium-review.googlesource.com/1148620Reviewed-by: Clemens Hammacher <clemensh@chromium.org>
Commit-Queue: Clemens Hammacher <clemensh@chromium.org>
Cr-Commit-Position: refs/heads/master@{#54658}