RFR: 8337783: Use THROW_NULL instead of THROW_0 in pointer contexts in misc runtime code

[Kim Barrett]

On Mon, 5 Aug 2024 07:01:45 GMT, Stefan Karlsson <stefank at openjdk.org> wrote:

> Looks good.
> 
> I saw at least one instance of THROW_ARG_0, which returns 0. Do you intend to fix that as a separate change?

Yes.  There are a few of those scattered about.  We don't currently have THROW_ARG_NULL to use in these places.
I chose to keep this change simple.

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PR Comment: https://git.openjdk.org/jdk/pull/20457#issuecomment-2269819374