Make PA's NoDestructor compatible with trivially destructible types.

There are some types which are only trivially destructible on certain
platforms, e.g. std::mutex. The current prohibition makes it rather
annoying to use NoDestructor with such a type.

Making NoDestructor constexpr also allows the constinit qualifier to be
used with NoDestructor when the type is trivially destructible, avoiding
the need to use a wrapper function at all.

Change-Id: Ifc6b6f44bd9a0bd57ac09fe43c5625cb90c06134
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5181785
Code-Coverage: findit-for-me@appspot.gserviceaccount.com <findit-for-me@appspot.gserviceaccount.com>
Reviewed-by: Takashi Sakamoto <tasak@google.com>
Commit-Queue: Daniel Cheng <dcheng@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1245998}