RFR: 8338330: Fix -Wzero-as-null-pointer-constant warnings from THROW_XXX_0

[Dean Long]

On Tue, 13 Aug 2024 22:19:45 GMT, Kim Barrett <kbarrett at openjdk.org> wrote:

> Please review this change to add THROW_ARG_NULL and THROW_HANDLE_NULL macros,
> and use them instead of the corresponding THROW_XXX_0 macros in contexts where
> a pointer value is needed.  This removes some -Wzero-as-null-pointer-constant
> warnings.
> 
> There aren't many uses of either (only one of the HANDLE variant).  An
> alternative would have been to change the callers to use the unsuffixed
> variant with a nullptr value argument.  Adding the macros is consistent with
> other THROW variants, and seems a little bit more readable.
> 
> Testing: mach5 tier1

Marked as reviewed by dlong (Reviewer).

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PR Review: https://git.openjdk.org/jdk/pull/20574#pullrequestreview-2236758685