RFR: 8337418: Fix -Wzero-as-null-pointer-constant warnings in prims code

[Kim Barrett]

On Tue, 30 Jul 2024 10:19:59 GMT, Aleksey Shipilev <shade at openjdk.org> wrote:

> All right, this looks fine. (I am somewhat allergic to `{}` syntax, but it is what it is.)

The hoops one had to go through to get guaranteed value-initialization before we had brace initialization are really
not pretty. See
https://www.boost.org/doc/libs/1_85_0/libs/utility/doc/html/utility/utilities/value_init.html
and its associated implementation.

It might help if we were to commit to using direct brace initialization whenever appropriate, but that hasn't happened.

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PR Comment: https://git.openjdk.org/jdk/pull/20385#issuecomment-2259500102