This reverts commit 91f08378.

Reason for revert: It's a fairly big change, and the clusterfuzz
found some bugs. Will reland with the fix after M98 branch point.

Original change's description:
> [class] implement reparsing of class instance member initializers
>
> Previously, since the source code for the synthetic class instance
> member initializer function was recorded as the span from the first
> initializer to the last initializer, there was no way to reparse the
> class and recompile the initializer function. It was working for
> most use cases because the code for the initializer function was
> generated eagarly and it was usually alive as long as the class was
> alive, so the initializer wouldn't normally be lazily parsed. This
> didn't work, however, when the class was snapshotted with
> v8::SnapshotCreator::FunctionCodeHandling::kClear,
> becuase then we needed to recompile the initializer when the class
> was instantiated. This patch implements the reparsing so that
> these classes can work with FunctionCodeHandling::kClear.
>
> This patch refactors ParserBase::ParseClassLiteral() so that we can
> reuse it for both parsing the class body normally and reparsing it
> to collect initializers. When reparsing the synthetic initializer
> function, we rewind the scanner to the beginning of the class, and
> parse the class body to collect the initializers. During the
> reparsing, field initializers are parsed with the full parser while
> methods of the class are pre-parsed.
>
> A few notable changes:
>
> - Extended the source range of the initializer function to cover the
>   entire class so that we can rewind the scanner to parse the class
>   body to collect initializers (previously, it starts from the first
>   field initializer and ends at the last initializer). This resulted
>   some expectation changes in the debugger tests, though the
>   initializers remain debuggable.
> - A temporary ClassScope is created during reparsing. After the class
>   is reparsed, we use the information from the ScopeInfo to update
>   the allocated indices of the variables in the ClassScope.
>
> Bug: v8:10704
> Change-Id: Ifb6431a1447d8844f2a548283d59158742fe9027
> Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2988830
> Reviewed-by: Leszek Swirski <leszeks@chromium.org>
> Reviewed-by: Toon Verwaest <verwaest@chromium.org>
> Commit-Queue: Joyee Cheung <joyee@igalia.com>
> Cr-Commit-Position: refs/heads/main@{#78299}

Bug: v8:10704
Change-Id: I039cb728ebf0ada438a8f26c7d2c2547dbe3bf2d
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3325328
Auto-Submit: Joyee Cheung <joyee@igalia.com>
Bot-Commit: Rubber Stamper <rubber-stamper@appspot.gserviceaccount.com>
Reviewed-by: Marja Hölttä <marja@chromium.org>
Reviewed-by: Leszek Swirski <leszeks@chromium.org>
Commit-Queue: Leszek Swirski <leszeks@chromium.org>
Cr-Commit-Position: refs/heads/main@{#78315}