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

[Kim Barrett]

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

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Commit messages:
 - add THROW_xxx_NULL

Changes: https://git.openjdk.org/jdk/pull/20574/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=20574&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8338330
  Stats: 14 lines in 3 files changed: 3 ins; 0 del; 11 mod
  Patch: https://git.openjdk.org/jdk/pull/20574.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/20574/head:pull/20574

PR: https://git.openjdk.org/jdk/pull/20574