This change updates some Torque-defined classes to include more precise
field types where possible. It also updates those classes to use
@generateCppClass. One field was removed because it's unused
(PrototypeInfo::validity_cell), and two fields in StackFrameInfo
actually became less precise because they're based on Script::name,
which is an embedder-provided untyped Local<Value>. (Automatically
generated accessors pointed out this bug easily.)

This change also includes a couple of minor fixes in Torque.

Change-Id: Ib2bc6c7165bb3612b6d344c0686a94165a568277
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2199640
Commit-Queue: Seth Brenith <seth.brenith@microsoft.com>
Reviewed-by: Ulan Degenbaev <ulan@chromium.org>
Reviewed-by: Toon Verwaest <verwaest@chromium.org>
Reviewed-by: Tobias Tebbi <tebbi@chromium.org>
Cr-Commit-Position: refs/heads/master@{#67907}