This is a reland of e47f9200

Relanding for clang only.
GCC and MSVC will not inline.

Original change's description:
> cppgc: Inline allocation fast path across api boundary
>
> Bug: chromium:1239030, chromium:1056170
> Change-Id: I4a559027e63ebbd99e51344aa659d4fb284df88f
> Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3190094
> Commit-Queue: Omer Katz <omerkatz@chromium.org>
> Reviewed-by: Anton Bikineev <bikineev@chromium.org>
> Reviewed-by: Michael Lippautz <mlippautz@chromium.org>
> Cr-Commit-Position: refs/heads/main@{#77124}

Bug: chromium:1239030, chromium:1056170
Change-Id: Iaa52118ea0e6ccd78f5e7818fa30ed163906da83
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3191211Reviewed-by: Michael Lippautz <mlippautz@chromium.org>
Commit-Queue: Omer Katz <omerkatz@chromium.org>
Cr-Commit-Position: refs/heads/main@{#77144}