RFR: 8336081: Fix -Wzero-as-null-pointer-constant warnings in JVMTypedFlagLimit ctors

[Julian Waters]

On Wed, 10 Jul 2024 12:29:21 GMT, Kim Barrett <kbarrett at openjdk.org> wrote:

> Please review this change to member initializers in the JVMTypedFlagLimit<T>
> class template.  It has two members of type T, which were being initialized
> with a literal value of 0, triggering -Wzero-as-null-pointer-constant when T
> is a pointer type and that warning is enabled.
> 
> We instead value initialize these members. For scalar types this performs
> zero-initialization, without triggering -Wzero-as-null-pointer-constant if
> it's a pointer type.
> 
> Testing: mach5 tier1

Marked as reviewed by jwaters (Committer).

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PR Review: https://git.openjdk.org/jdk/pull/20112#pullrequestreview-2170929127