Instead of putting "Foo" as type into the list macro, and
then extending to "type*" at consumer macros, put "Foo*"
into the macro.
This is in preparation for incremental transition to ObjectPtr,
where some roots will return pointer types and others won't.
When that migration is complete, everything will be uniform
(and without "*") again.

Bug: v8:3770
Change-Id: Ib4a9900b1fc6e59f5fc924b779ed7e94dc136ad0
Reviewed-on: https://chromium-review.googlesource.com/c/1285397
Commit-Queue: Jakob Kummerow <jkummerow@chromium.org>
Reviewed-by: Ulan Degenbaev <ulan@chromium.org>
Reviewed-by: Dan Elphick <delphick@chromium.org>
Cr-Commit-Position: refs/heads/master@{#56798}