RFR: add use site null checks [v9]

[Maurizio Cimadamore]

On Fri, 16 Jan 2026 14:09:31 GMT, Vicente Romero <vromero at openjdk.org> wrote:

>> Adding use site null checks for method invocations. They are added by default but if option: `noUseSiteNullChecks` is passed, the compiler won't generate them
>
> Vicente Romero has updated the pull request incrementally with two additional commits since the last revision:
> 
>  - Apply suggestion from @vicente-romero-oracle
>  - last change

Marked as reviewed by mcimadamore (Committer).

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PR Review: https://git.openjdk.org/valhalla/pull/1910#pullrequestreview-3671089329